[ussuri][goal] Drop python 2.7 support and testing

OpenStack is dropping the py2.7 support in ussuri cycle.

Congress is ready with python 3 and ok to drop the
python 2.7 support.

Complete discussion & schedule can be found in
- http://lists.openstack.org/pipermail/openstack-discuss/2019-October/010142.html
- https://etherpad.openstack.org/p/drop-python2-support

Ussuri Communtiy-wide goal:
https://governance.openstack.org/tc/goals/selected/ussuri/drop-py27.html

Depends-On: https://review.opendev.org/#/c/693631/
Change-Id: I23fcb01265b734c0a87f5ad81b25a1eac179eb06

.zuul.yaml

@@ -43,12 +43,6 @@
         tempest: true
         neutron-qos: true
         horizon: false
-        # swift disabled for py3
-        s-proxy: false
-        s-object: false
-        s-container: false
-        s-account: false
-        c-bak: false  # requires swift
       tempest_concurrency: 1
       tox_envlist: all
       tempest_test_regex: congress_tempest_plugin.*
@@ -60,6 +54,7 @@
         CONGRESS_EXPOSE_ENCRYPTION_KEY_FOR_TEST: true
         ENABLE_CONGRESS_Z3: true
         USE_Z3_RELEASE: 4.7.1
+        USE_PYTHON3: True
 
 - job:
     name: congress-tempest-ipv6-only
@@ -73,22 +68,6 @@
       <<: *base_vars
       tempest_test_regex: '(^congress_tempest_plugin.*)(\[.*\bsmoke\b.*\])'
 
-- job:
-    name: congress-tempest-py2
-    parent: congress-tempest-base
-    vars:
-      devstack_plugins:
-        aodh: https://opendev.org/openstack/aodh
-        mistral: https://opendev.org/openstack/mistral
-        monasca-api: https://opendev.org/openstack/monasca-api
-        murano: https://opendev.org/openstack/murano
-      devstack_services:
-        s-proxy: true
-        s-object: true
-        s-container: true
-        s-account: true
-        c-bak: true
-
 - job:
     name: congress-tempest-py3
     parent: congress-tempest-base
@@ -123,12 +102,6 @@
         mysql: false
         postgresql: true
 
-- job:
-    name: congress-tempest-py2-mysql
-    parent: congress-tempest-py2
-    vars:
-      database: mysql
-
 - job:
     name: congress-tempest-py3-mysql
     parent: congress-tempest-py3
@@ -136,7 +109,7 @@
       database: mysql
 
 - job:
-    name: congress-tempest-py2-JsonIngester
+    name: congress-tempest-py3-JsonIngester
     parent: congress-tempest-base
     voting: false
     vars:
@@ -144,15 +117,7 @@
         ENABLE_CONGRESS_JSON: true
 
 - job:
-    name: congress-tempest-py3-JsonIngester
+    name: congress-tempest-py3-postgresql
-    parent: congress-tempest-py2-JsonIngester
-    voting: false
-    vars:
-      devstack_localrc:
-        USE_PYTHON3: true
-
-- job:
-    name: congress-tempest-py2-postgresql
     parent: congress-tempest-base
     voting: false
     vars:
@@ -160,30 +125,19 @@
         mysql: false
         postgresql: true
 
-- job:
-    name: congress-tempest-py3-postgresql
-    parent: congress-tempest-py2-postgresql
-    voting: false
-    vars:
-      devstack_localrc:
-        USE_PYTHON3: true
-
 - project:
     templates:
       - check-requirements
       - openstack-cover-jobs
       - openstack-lower-constraints-jobs
-      - openstack-python-jobs
+      - openstack-python3-ussuri-jobs
-      - openstack-python3-train-jobs
       - release-notes-jobs-python3
       - publish-openstack-docs-pti
       - periodic-stable-jobs
     check:
       jobs:
-        - congress-tempest-py2-mysql
         - congress-tempest-py3-mysql
         - congress-tempest-replicated-postgresql
-        - congress-tempest-py2-JsonIngester
         - congress-tempest-py3-JsonIngester
         - congress-tempest-ipv6-only
         # Note: the above jobs most likely provides sufficient coverage
@@ -205,6 +159,5 @@
     gate:
       queue: congress
       jobs:
-        - congress-tempest-py2-mysql
         - congress-tempest-py3-mysql
         - congress-tempest-ipv6-only

doc/requirements.txt

@@ -4,6 +4,5 @@
 
 openstackdocstheme>=1.18.1 # Apache-2.0
 reno>=2.5.0 # Apache-2.0
-sphinx!=1.6.6,!=1.6.7,>=1.6.2,<2.0.0;python_version=='2.7'  # BSD
 sphinx!=1.6.6,!=1.6.7,>=1.6.2;python_version>='3.4'  # BSD
 sphinxcontrib-apidoc>=0.2.0  # BSD

releasenotes/notes/drop-py-2-7-fab5c163d3927708.yaml

@@ -0,0 +1,6 @@
+---
+upgrade:
+  - |
+    Python 2.7 support has been dropped. Last release of Congress
+    to support python 2.7 is OpenStack Train. The minimum version of Python now
+    supported by Congress is Python 3.6.

setup.cfg

@@ -13,8 +13,6 @@ classifier =
     License :: OSI Approved :: Apache Software License
     Operating System :: POSIX :: Linux
     Programming Language :: Python
-    Programming Language :: Python :: 2
-    Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7

tox.ini

@@ -1,9 +1,10 @@
 [tox]
 minversion = 2.0
 skipsdist = True
-envlist = py37,py36,py27,pep8,genpolicy
+envlist = py37,py36,pep8,genpolicy
 
 [testenv]
+basepython = python3
 usedevelop = True
 
 install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master} -U {opts} {packages}
@@ -21,18 +22,15 @@ commands =
  stestr run --slowest --concurrency=1 {posargs}
 
 [testenv:pep8]
-basepython = python3
 usedevelop = False
 deps =
 commands = {toxinidir}/tools/pip-install-single-req.sh test-requirements.txt hacking
            flake8
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [testenv:cover]
-basepython = python3
 setenv =
     PYTHON=coverage run --source congress --parallel-mode
 commands =
@@ -45,11 +43,9 @@ commands =
   coverage report
 
 [testenv:debug]
-basepython = python3
 commands = oslo_debug_helper -t congress/tests {posargs}
 
 [testenv:bench]
-basepython = python3
 setenv =
    TEST_BENCHMARK=true
    VIRTUAL_ENV={envdir}
@@ -65,18 +61,15 @@ builtins = _
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build,*thirdparty/*,CongressLexer.py,CongressParser.py,contrib/*
 
 [testenv:genconfig]
-basepython = python3
 deps =
 commands = {toxinidir}/tools/pip-install-single-req.sh requirements.txt oslo.config
            oslo-config-generator --config-file=etc/congress-config-generator.conf
            oslo-config-generator --config-file=etc/congress-agent-config-generator.conf
 
 [testenv:genpolicy]
-basepython = python3
 commands = oslopolicy-sample-generator --config-file etc/congress-policy-generator.conf
 
 [testenv:docs]
-basepython = python3
 setenv = PYTHONHASHSEED=0
 deps = -r{toxinidir}/doc/requirements.txt
        -r{toxinidir}/requirements.txt
@@ -84,7 +77,6 @@ commands = rm -rf doc/build doc/source/api
            sphinx-build -W -b html doc/source doc/build/html
 
 [testenv:pdf-docs]
-basepython = python3
 envdir = {toxworkdir}/docs
 deps = {[testenv:docs]deps}
 whitelist_externals =
@@ -94,12 +86,10 @@ commands =
   make -C doc/build/pdf
 
 [testenv:releasenotes]
-basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:bindep]
-basepython = python3
 # Do not install any requirements. We want this to be fast and work even if
 # system dependencies are missing, since it's used to tell you what system
 # dependencies are missing! This also means that bindep must be installed
@@ -111,7 +101,6 @@ commands = bindep test
 usedevelop = False
 
 [testenv:lower-constraints]
-basepython = python3
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt