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][3].

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
[3] https://governance.openstack.org/tc/reference/runtimes/train.html

Depends-On: I1b0496d3048f832cd60be70703a23cc712f8693d

Change-Id: I071bd473617691ee72e29547e320dd8d9781ee75

.zuul.yaml

@@ -3,7 +3,6 @@
       - build-openstack-docs-pti
       - check-requirements
       - openstack-python-jobs-neutron
-      - openstack-python35-jobs-neutron
       - openstack-python36-jobs
     check:
       jobs:
@@ -33,19 +32,6 @@
               - openstack/neutron-vpnaas
               - x/tap-as-a-service
               - openstack/octavia
-        - openstack-tox-py35:
-            timeout: 5400
-            required-projects:
-              - openstack/neutron
-              - openstack/networking-l2gw
-              - openstack/networking-sfc
-              - openstack/neutron-lbaas
-              - x/vmware-nsxlib
-              - openstack/neutron-fwaas
-              - openstack/neutron-dynamic-routing
-              - openstack/neutron-vpnaas
-              - x/tap-as-a-service
-              - openstack/octavia
         - openstack-tox-py36:
             timeout: 5400
             required-projects:
@@ -88,19 +74,6 @@
               - openstack/neutron-vpnaas
               - x/tap-as-a-service
               - openstack/octavia
-        - openstack-tox-py35:
-            timeout: 5400
-            required-projects:
-              - openstack/neutron
-              - openstack/networking-l2gw
-              - openstack/networking-sfc
-              - openstack/neutron-lbaas
-              - x/vmware-nsxlib
-              - openstack/neutron-fwaas
-              - openstack/neutron-dynamic-routing
-              - openstack/neutron-vpnaas
-              - x/tap-as-a-service
-              - openstack/octavia
         - openstack-tox-py36:
             timeout: 5400
             required-projects:

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

@@ -1,5 +1,5 @@
 [tox]
-envlist = py35,py36,py27,pep8,docs
+envlist = py36,py27,pep8,docs
 minversion = 2.0
 skipsdist = True