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

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

Cloudkitty 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: I44ea5cfe479558969ccb3ca57f416511614626cc

.zuul.yaml

@@ -28,6 +28,7 @@
       tox_envlist: all
       devstack_localrc:
         CLOUDKITTY_FETCHER: keystone
+        USE_PYTHON3: True
         TEMPEST_PLUGINS: /opt/stack/cloudkitty-tempest-plugin
 
 - job:
@@ -64,68 +65,35 @@
     name: cloudkitty-tempest-full-v1-storage-sqlalchemy
     parent: base-cloudkitty-v1-api-tempest-job
     description: |
-      Job testing cloudkitty installation on devstack with python 2 and the
+      Job testing cloudkitty installation on devstack with python 3 and the
       SQLAlchemy v1 storage driver and running tempest tests
     vars:
       devstack_localrc:
         CLOUDKITTY_STORAGE_BACKEND: sqlalchemy
         CLOUDKITTY_STORAGE_VERSION: 1
 
-- job:
-    name: cloudkitty-tempest-full-v1-storage-sqlalchemy-py3
-    parent: cloudkitty-tempest-full-v1-storage-sqlalchemy
-    description: |
-      Job testing cloudkitty installation on devstack with python 3 and the
-      SQLAlchemy v1 storage driver and running tempest tests
-    vars:
-      devstack_localrc:
-        DEVSTACK_GATE_USE_PYTHON3: "True"
-        USE_PYTHON3: "True"
-
 - job:
     name: cloudkitty-tempest-full-v2-storage-influxdb
     parent: base-cloudkitty-v2-api-tempest-job
     description: |
-      Job testing cloudkitty installation on devstack with python 2 and the
+      Job testing cloudkitty installation on devstack with python 3 and the
       InfluxDB v2 storage driver and running tempest tests
     vars:
       devstack_localrc:
         CLOUDKITTY_STORAGE_BACKEND: influxdb
         CLOUDKITTY_STORAGE_VERSION: 2
 
-- job:
-    name: cloudkitty-tempest-full-v2-storage-influxdb-py3
-    parent: cloudkitty-tempest-full-v2-storage-influxdb
-    description: |
-      Job testing cloudkitty installation on devstack with python 3 and the
-      InfluxDB v2 storage driver and running tempest tests
-    vars:
-      devstack_localrc:
-        DEVSTACK_GATE_USE_PYTHON3: "True"
-        USE_PYTHON3: "True"
-
 - job:
     name: cloudkitty-tempest-full-v2-storage-elasticsearch
     parent: base-cloudkitty-v2-api-tempest-job
     description: |
-      Job testing cloudkitty installation on devstack with python 2 and the
+      Job testing cloudkitty installation on devstack with python 3 and the
       Elasticsearch v2 storage driver and running tempest tests
     vars:
       devstack_localrc:
         CLOUDKITTY_STORAGE_BACKEND: elasticsearch
         CLOUDKITTY_STORAGE_VERSION: 2
 
-- job:
-    name: cloudkitty-tempest-full-v2-storage-elasticsearch-py3
-    parent: cloudkitty-tempest-full-v2-storage-elasticsearch
-    description: |
-      Job testing cloudkitty installation on devstack with python 3 and the
-      elasticsearch v2 storage driver and running tempest tests
-    vars:
-      devstack_localrc:
-        DEVSTACK_GATE_USE_PYTHON3: "True"
-        USE_PYTHON3: "True"
-
 - job:
     name: cloudkitty-tox-bandit
     parent: openstack-tox
@@ -154,20 +122,15 @@
       - openstack-lower-constraints-jobs
       - check-requirements
       - openstack-cover-jobs
-      - openstack-python-jobs
       - openstack-python3-ussuri-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3
     check:
       jobs:
         - cloudkitty-tempest-full-v2-storage-influxdb
-        - cloudkitty-tempest-full-v2-storage-influxdb-py3
         - cloudkitty-tempest-full-v2-storage-elasticsearch:
             voting: false
-        - cloudkitty-tempest-full-v2-storage-elasticsearch-py3:
-            voting: false
         - cloudkitty-tempest-full-v1-storage-sqlalchemy
-        - cloudkitty-tempest-full-v1-storage-sqlalchemy-py3
         - cloudkitty-tempest-full-ipv6-only
         - cloudkitty-tox-bandit:
             voting: false
@@ -175,7 +138,5 @@
       queue: cloudkitty
       jobs:
         - cloudkitty-tempest-full-v2-storage-influxdb
-        - cloudkitty-tempest-full-v2-storage-influxdb-py3
         - cloudkitty-tempest-full-v1-storage-sqlalchemy
-        - cloudkitty-tempest-full-v1-storage-sqlalchemy-py3
         - cloudkitty-tempest-full-ipv6-only

releasenotes/notes/drop-py-2-7-fcf8c0613a7bffa8.yaml

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

test-requirements.txt

@@ -12,7 +12,6 @@ gabbi>=1.26.1 # Apache-2.0
 testscenarios>=0.4 # Apache-2.0/BSD
 stestr>=2.0.0 # Apache-2.0
 mock>=1.2 # BSD
-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,!=2.1.0,>=1.6.2;python_version>='3.4' # BSD
 openstackdocstheme>=1.30.0 # Apache-2.0
 oslotest>=1.10.0 # Apache-2.0

tox.ini

@@ -1,9 +1,10 @@
 [tox]
 minversion = 2.0
 skipsdist = True
-envlist = py36,py37,py27,pep8
+envlist = py36,py37,pep8
 
 [testenv]
+basepython = python3
 whitelist_externals = rm
 setenv = VIRTUAL_ENV={envdir}
          PYTHONWARNINGS=default::DeprecationWarning
@@ -18,22 +19,18 @@ commands =
   stestr run {posargs}
 
 [testenv:debug]
-basepython = python3
 commands = oslo_debug_helper {posargs}
 
 [testenv:pep8]
-basepython = python3
 commands =
     flake8 {posargs} cloudkitty
     doc8 {posargs}
 
 [testenv:bandit]
-basepython = python3
 deps = -r{toxinidir}/test-requirements.txt
 commands = bandit -r cloudkitty -n5 -x cloudkitty/tests/* -ll
 
 [testenv:cover]
-basepython = python3
 setenv =
     VIRTUAL_ENV={envdir}
     PYTHON=coverage run --source cloudkitty --parallel-mode
@@ -45,20 +42,16 @@ commands =
     coverage report
 
 [testenv:genconfig]
-basepython = python3
 commands =
   oslo-config-generator --config-file etc/oslo-config-generator/cloudkitty.conf
 
 [testenv:genpolicy]
-basepython = python3
 commands = oslopolicy-sample-generator --config-file=etc/oslo-policy-generator/cloudkitty.conf
 
 [testenv:docs]
-basepython = python3
 commands = python setup.py build_sphinx
 
 [testenv:pdf-docs]
-basepython = python3
 envdir = {toxworkdir}/docs
 whitelist_externals =
   make
@@ -67,7 +60,6 @@ commands =
   make -C doc/build/pdf
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [flake8]
@@ -82,11 +74,9 @@ import_exceptions = cloudkitty.i18n
 local-check-factory = cloudkitty.hacking.checks.factory
 
 [testenv:releasenotes]
-basepython = python3
 commands = sphinx-build -a -E -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:lower-constraints]
-basepython = python3
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt