Add Python 3 Train unit tests

This is a mechanically generated patch to ensure unit testing is in place
for all of the Tested Runtimes for Train.

See the Train python3-updates goal document for details:
https://governance.openstack.org/tc/goals/train/python3-updates.html

Change-Id: I409d9e3db05eaf11ccaaaef8784d693f40687328
Story: #2005924
Task: #34213

setup.cfg

@@ -8,11 +8,17 @@ home-page = https://docs.openstack.org/ironic-python-agent/
 summary = Ironic Python Agent Ramdisk
 license = Apache-2
 classifier =
-    Development Status :: 4 - Beta
-        Intended Audience :: Developers
-        License :: OSI Approved :: Apache Software License
-        Operating System :: OS Independent
-        Programming Language :: Python
+    Environment :: OpenStack
+    Intended Audience :: System Administrators
+    Intended Audience :: Information Technology
+    License :: OSI Approved :: Apache Software License
+    Operating System :: OS Independent
+    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
 [files]
 packages =
     ironic_python_agent

zuul.d/project.yaml

@@ -1,7 +1,7 @@
 - project:
     templates:
       - openstack-python-jobs
-      - openstack-python36-jobs
+      - openstack-python3-train-jobs
       - openstack-cover-jobs
       - publish-openstack-docs-pti
       - check-requirements