py3: use the train test template and other updatestrain-em2.3.0

Use the unified unit test Zuul template for train, according the
community goal. Also, update the setup.cfg classifiers accordingly.

Update the debug test environment. Adding "debug-py36" is enough;
if a distribution supports 3.7, the "debug" tox environment
can be used.

Finally, keep only the most recent environment in the default
set executed when calling tox.

Story: #2005924
Task: #34244

Change-Id: Iad4a6e933ad416eb67a2f144540fe79e97938bec

1 files changed, 1 insertions, 1 deletions

diff --git a/setup.cfg b/setup.cfg
index e5adcad..f86f8a8 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -17,8 +17,8 @@ classifier =
     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
 
 [global]
 setup-hooks = pbr.hooks.setup_hook