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: I5e4a9148c0e0649ff0e4657ea4c87e50c1b3fd2d

.zuul.yaml

@@ -7,14 +7,12 @@
       - openstack-cover-jobs
       - openstack-lower-constraints-jobs
       - openstack-python-jobs
-      - openstack-python35-jobs
       - openstack-python36-jobs
       - openstack-python37-jobs
       - release-notes-jobs-python3
     check:
       jobs:
         - openstack-tox-functional
-        - openstack-tox-functional-py35
         - openstack-tox-functional-py36
         - placement-perfload:
             voting: false
@@ -40,7 +38,6 @@
     gate:
       jobs:
         - openstack-tox-functional
-        - openstack-tox-functional-py35
         - openstack-tox-functional-py36
         - tempest-full-py3:
             irrelevant-files: *gate-irrelevant-files

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
 
 [global]
 setup-hooks =

tox.ini

@@ -43,11 +43,6 @@ envdir = {toxworkdir}/py27
 commands =
   stestr --test-path=./placement/tests/functional run {posargs}
 
-[testenv:functional-py35]
-envdir = {toxworkdir}/py35
-commands =
-  {[testenv:functional]commands}
-
 [testenv:functional-py36]
 envdir = {toxworkdir}/py36
 commands =