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

This drops python2.7 support for cloudkitty-tempest-plugin. The lowest python
version now supported by cloudkitty-tempest-plugin is 3.6.

Depends-On: https://review.opendev.org/#/c/694434/
Change-Id: I2b4a57dae3f150b22c38cc2b83747ee4231b31fe

.zuul.yaml

@@ -6,16 +6,10 @@
       jobs: &cloudkitty_tempest_jobs
         - cloudkitty-tempest-full-v2-storage-influxdb:
             voting: true
-        - cloudkitty-tempest-full-v2-storage-influxdb-py3:
-            voting: true
         - cloudkitty-tempest-full-v1-storage-sqlalchemy:
             voting: true
-        - cloudkitty-tempest-full-v1-storage-sqlalchemy-py3:
-            voting: true
         - cloudkitty-tempest-full-v2-storage-elasticsearch:
             voting: true
-        - cloudkitty-tempest-full-v2-storage-elasticsearch-py3:
-            voting: true
     gate:
       queue: cloudkitty
       jobs: *cloudkitty_tempest_jobs

setup.cfg

@@ -13,10 +13,9 @@ 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 :: 3.5
+    Programming Language :: Python :: 3.6
+    Programming Language :: Python :: 3.7
 
 [files]
 packages =

test-requirements.txt

@@ -6,7 +6,6 @@ hacking>=1.1.0,<1.2.0 # Apache-2.0
 
 coverage>=4.0,!=4.4 # Apache-2.0
 python-subunit>=0.0.18 # Apache-2.0/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,>=1.6.2;python_version>='3.4'  # BSD
 oslotest>=1.10.0 # Apache-2.0
 stestr>=1.0.0 # Apache-2.0

tox.ini

@@ -1,9 +1,10 @@
 [tox]
 minversion = 2.0
-envlist = py35,py27,pypy,pep8
+envlist = py36,py37,pypy,pep8
 skipsdist = True
 
 [testenv]
+basepython = python3
 usedevelop = True
 install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master} {opts} {packages}
 setenv =
@@ -16,15 +17,12 @@ deps = -r{toxinidir}/test-requirements.txt
 commands = stestr run {posargs}
 
 [testenv:pep8]
-basepython = python3
 commands = flake8 {posargs}
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [testenv:cover]
-basepython = python3
 setenv =
     VIRTUAL_ENV={envdir}
     PYTHON=coverage run --source cloudkitty_tempest_plugin --parallel-mode
@@ -35,7 +33,6 @@ commands =
     coverage xml -o cover/coverage.xml
 
 [testenv:debug]
-basepython = python3
 commands = oslo_debug_helper {posargs}
 
 [flake8]