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: I449af10676f087ec75d2ca014045e33dc2a0fa4b

.zuul.yaml

@@ -4,7 +4,6 @@
       - openstack-cover-jobs-horizon
       - openstack-lower-constraints-jobs-horizon
       - openstack-python-jobs-horizon
-      - openstack-python35-jobs-horizon
       - publish-openstack-docs-pti
       - release-notes-jobs-python3
     check:

setup.cfg

@@ -16,7 +16,7 @@ classifier =
     Programming Language :: Python :: 2
     Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.5
+    Programming Language :: Python :: 3.6
 
 [files]
 packages =

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion = 1.6
-envlist = py35,py27,pep8,py27dj19,py27dj110,py3-dj111
+envlist = py27,pep8,py27dj19,py27dj110,py3-dj111
 skipsdist = True
 
 [testenv]
@@ -15,9 +15,6 @@ commands = /bin/bash run_tests.sh -N --no-pep8 {posargs}
 [testenv:py27]
 setenv = DJANGO_SETTINGS_MODULE=manila_ui.tests.settings
 
-[testenv:py35]
-setenv = DJANGO_SETTINGS_MODULE=manila_ui.tests.settings
-
 [testenv:py36]
 setenv = DJANGO_SETTINGS_MODULE=manila_ui.tests.settings