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

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

kolla-cli also drop py2 testing and 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

Change-Id: I44fe93012739ad190f8d0fe593e70863ab238158

.zuul.yaml

@@ -1,18 +1,4 @@
 ---
-- job:
-    name: kollacli-tox-functional-py27
-    parent: openstack-tox
-    description: |
-      Run tox-based py27 functional tests for the OpenStack Kolla-cli project.
-      Uses tox with the ``functional`` environment.
-    irrelevant-files:
-      - ^.*\.rst$
-      - ^doc/source/.*$
-      - ^releasenotes/.*$
-    vars:
-      tox_envlist: functional-py27
-    timeout: 3600
-
 - job:
     name: kollacli-tox-functional-py36
     parent: openstack-tox

doc/requirements.txt

@@ -4,6 +4,5 @@
 
 openstackdocstheme>=1.18.1 # Apache-2.0
 reno>=2.5.0 # Apache-2.0
-sphinx>=1.8.0,<2.0.0;python_version=='2.7' # BSD
-sphinx>=1.8.0,!=2.1.0;python_version>='3.4' # BSD
+sphinx>=1.8.0,!=2.1.0 # BSD
 sphinxcontrib-pecanwsme>=0.8

releasenotes/notes/drop-py-2-7-311423474c63c9c5.yaml

@@ -0,0 +1,5 @@
+upgrade:
+  - |
+    Python 2.7 support has been dropped. Last release of kolla-cli
+    to support py2.7 is OpenStack Train. The minimum version of Python now
+    supported by kolla-cli is Python 3.6.

setup.cfg

@@ -14,8 +14,6 @@ classifier =
     Intended Audience :: System Administrators
     License :: OSI Approved :: Apache Software License
     Operating System :: POSIX :: Linux
-    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

@@ -12,10 +12,10 @@ coverage>=4.0
 doc8>=0.6.0 # Apache-2.0
 fixtures>=3.0.0
 mock>=2.0.0
-mypy>=0.6; python_version>'2.7'
+mypy>=0.6
 oslo.utils>=3.33.0 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
 stestr>=2.0.0 # Apache-2.0
 pexpect>=4.0.1
 testtools>=2.2.0
-typing>=3.6; python_version>'2.7'
+typing>=3.6

tox.ini

@@ -1,9 +1,11 @@
 [tox]
-minversion = 2.5.0
+minversion = 3.1
 skipsdist = True
-envlist = py37,pep8,mypy,py27
+envlist = py37,pep8,mypy
+ignore_basepython_conflict = True
 
 [testenv]
+basepython = python3
 usedevelop=True
 whitelist_externals =
   find
@@ -25,7 +27,6 @@ commands =
   stestr run {posargs}
 
 [testenv:debug]
-basepython = python3
 description = Allows to run unit-test with debug mode enabled
 setenv =
   KOLLA_ETC = /tmp/kollaclitest/etc/kolla
@@ -49,11 +50,6 @@ commands =
   bash -c "pushd /tmp/kollaclitest/usr/share/kolla-ansible/git; python setup.py install; popd"
   stestr run {posargs} --serial
 
-[testenv:functional-py27]
-basepython = python2.7
-setenv = {[testenv:functional]setenv}
-commands = {[testenv:functional]commands}
-
 [testenv:functional-py36]
 basepython = python3.6
 setenv = {[testenv:functional]setenv}
@@ -65,7 +61,6 @@ setenv = {[testenv:functional]setenv}
 commands = {[testenv:functional]commands}
 
 [testenv:pep8]
-basepython = python3
 deps = {[testenv]deps}
 commands =
   flake8 {posargs}
@@ -73,13 +68,11 @@ commands =
   {[testenv:bandit]commands}
 
 [testenv:mypy]
-basepython = python3
 skip_install = true
 commands =
   mypy --py2 --ignore-missing-imports kolla_cli
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [flake8]
@@ -87,12 +80,10 @@ show-source = True
 exclude = .venv,.git,.tox,dist,doc,*lib/python*,*egg,build
 
 [testenv:bandit]
-basepython = python3
 # Run security linter
 commands = bandit -r kolla_cli -x tests
 
 [testenv:docs]
-basepython = python3
 deps =
    {[testenv]deps}
    -r{toxinidir}/doc/requirements.txt
@@ -101,7 +92,6 @@ commands =
   sphinx-build -W --keep-going -b html doc/source doc/build/html
 
 [testenv:pdf-docs]
-basepython = python3
 deps = {[testenv:docs]deps}
 commands =
     rm -rf doc/build/pdf
@@ -110,7 +100,6 @@ commands =
     make -C doc/build/pdf
 
 [testenv:releasenotes]
-basepython = python3
 deps =
    {[testenv]deps}
    -r{toxinidir}/doc/requirements.txt
@@ -119,7 +108,6 @@ commands =
   sphinx-build -a -E -W -d releasenotes/build/doctrees --keep-going -b html releasenotes/source releasenotes/build/html
 
 [testenv:cover]
-basepython = python3
 setenv = VIRTUAL_ENV={envdir}
          NOSE_WITH_COVERAGE=1
          NOSE_COVER_BRANCHES=1
@@ -133,7 +121,6 @@ commands =
     coverage xml -o cover/coverage.xml
 
 [testenv:lower-constraints]
-basepython = python3
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt