Dropping the py35 testing

All the integration testing has been moved to
Bionic now[1] and py3.5 is not tested runtime for
Train or stable/stein[2].

As per below ML thread, we are good to drop the py35
testing now:
http://lists.openstack.org/pipermail/openstack-discuss/2019-April/005097.html

[1] http://lists.openstack.org/pipermail/openstack-discuss/2019-April/004647.html
[2]
https://governance.openstack.org/tc/reference/runtimes/stein.html
https://governance.openstack.org/tc/reference/runtimes/train.html

Change-Id: Idb246e18956ae67795b06d2968c0d5ee19940e47

.zuul.yaml

@@ -14,12 +14,12 @@
     check:
       jobs:
         - openstack-tox-functional
-        - openstack-tox-functional-py35
+        - openstack-tox-functional-py36
         - tempest-smoke-py3-osprofiler-redis
     gate:
       jobs:
         - openstack-tox-functional
-        - openstack-tox-functional-py35
+        - openstack-tox-functional-py36
         - tempest-smoke-py3-osprofiler-redis
 
 - job:

setup.cfg

@@ -15,7 +15,8 @@ classifier =
     Programming Language :: Python
     Programming Language :: Python :: 2
     Programming Language :: Python :: 2.7
-    Programming Language :: Python :: 3.5
+    Programming Language :: Python :: 3
+    Programming Language :: Python :: 3.6
 
 [files]
 packages =

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 minversion = 2.0
 skipsdist = True
-envlist = py35,py27,pep8
+envlist = py36,py27,pep8
 
 [testenv]
 setenv = VIRTUAL_ENV={envdir}
@@ -25,8 +25,8 @@ deps =
   {[testenv]deps}
   oslo.messaging
 
-[testenv:functional-py35]
+[testenv:functional-py36]
-basepython = python3.5
+basepython = python3.6
 setenv = {[testenv:functional]setenv}
 deps = {[testenv:functional]deps}