Merge "Add Python 3 Train unit tests"

.zuul.yaml

 - project:
     templates:
       - python35-charm-jobs
+      - openstack-python3-train-jobs
       - openstack-cover-jobs

setup.cfg

@@ -11,6 +11,10 @@ classifier =
     Intended Audience :: System Administrators
     License :: OSI Approved :: Apache Software License
     Operating System :: POSIX :: Linux
+    Programming Language :: Python :: 3
+    Programming Language :: Python :: 3.5
+    Programming Language :: Python :: 3.6
+    Programming Language :: Python :: 3.7
 
 [nosetests]
 verbosity=2

tox.ini

@@ -2,7 +2,7 @@
 # This file is managed centrally by release-tools and should not be modified
 # within individual charm repos.
 [tox]
-envlist = pep8,py3
+envlist = pep8,py37
 skipsdist = True
 
 [testenv]
@@ -27,6 +27,11 @@ basepython = python3.6
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 
+[testenv:py37]
+basepython = python3.7
+deps = -r{toxinidir}/requirements.txt
+       -r{toxinidir}/test-requirements.txt
+
 [testenv:py3]
 basepython = python3
 deps = -r{toxinidir}/requirements.txt