Periodic jobs are failing for python 3.5

Periodic tips jobs are failing because python 3.5 interpreter
is not available on testing nodes. It is decided that Stein
branch should be tested with python 3.6 version.

Renamed periodic tips jobs to 3.6 and added python 3.6 enviornment
in tox.ini to run periodic tips jobs against python 3.6
environment.

Change-Id: I8a763eff7c6524969b1fabf98ab0a5624954d8b3
Closes-Bug: #1822238

.zuul.yaml

@@ -66,12 +66,12 @@
       tox_envlist: functional
 
 - job:
-    name: glance-tox-functional-py35-oslo-tips
+    name: glance-tox-functional-py36-oslo-tips
     parent: glance-tox-oslo-tips-base
     description: |
-      Glance py35 functional tests vs. oslo libraries masters
+      Glance py36 functional tests vs. oslo libraries masters
     vars:
-      tox_envlist: functional-py35
+      tox_envlist: functional-py36
 
 - job:
     name: glance-tox-keystone-tips-base
@@ -92,12 +92,12 @@
       tox_envlist: py27
 
 - job:
-    name: glance-tox-py35-keystone-tips
+    name: glance-tox-py36-keystone-tips
     parent: glance-tox-keystone-tips-base
     description: |
-      Glance py35 unit tests vs. keystone masters
+      Glance py36 unit tests vs. keystone masters
     vars:
-      tox_envlist: py35
+      tox_envlist: py36
 
 - job:
     name: glance-tox-functional-keystone-tips
@@ -108,12 +108,12 @@
       tox_envlist: functional
 
 - job:
-    name: glance-tox-functional-py35-keystone-tips
+    name: glance-tox-functional-py36-keystone-tips
     parent: glance-tox-keystone-tips-base
     description: |
-      Glance py35 functional tests vs. keystone masters
+      Glance py36 functional tests vs. keystone masters
     vars:
-      tox_envlist: functional-py35
+      tox_envlist: functional-py36
 
 - job:
     name: glance-tox-glance_store-tips-base
@@ -132,12 +132,12 @@
       tox_envlist: py27
 
 - job:
-    name: glance-tox-py35-glance_store-tips
+    name: glance-tox-py36-glance_store-tips
     parent: glance-tox-glance_store-tips-base
     description: |
-      Glance py35 unit tests vs. glance_store master
+      Glance py36 unit tests vs. glance_store master
     vars:
-      tox_envlist: py35
+      tox_envlist: py36
 
 - job:
     name: glance-tox-functional-glance_store-tips
@@ -148,12 +148,12 @@
       tox_envlist: functional
 
 - job:
-    name: glance-tox-functional-py35-glance_store-tips
+    name: glance-tox-functional-py36-glance_store-tips
     parent: glance-tox-glance_store-tips-base
     description: |
-      Glance py35 functional tests vs. glance_store master
+      Glance py36 functional tests vs. glance_store master
     vars:
-      tox_envlist: functional-py35
+      tox_envlist: functional-py36
 
 - job:
     name: glance-tox-cursive-tips-base
@@ -174,12 +174,12 @@
       tox_envlist: py27
 
 - job:
-    name: glance-tox-py35-cursive-tips
+    name: glance-tox-py36-cursive-tips
     parent: glance-tox-cursive-tips-base
     description: |
-      Glance py35 unit tests vs. cursive (and related libs) master
+      Glance py36 unit tests vs. cursive (and related libs) master
     vars:
-      tox_envlist: py35
+      tox_envlist: py36
 
 - job:
     name: glance-tox-functional-cursive-tips
@@ -190,12 +190,12 @@
       tox_envlist: functional
 
 - job:
-    name: glance-tox-functional-py35-cursive-tips
+    name: glance-tox-functional-py36-cursive-tips
     parent: glance-tox-cursive-tips-base
     description: |
-      Glance py35 functional tests vs. cursive (and related libs) master
+      Glance py36 functional tests vs. cursive (and related libs) master
     vars:
-      tox_envlist: functional-py35
+      tox_envlist: functional-py36
 
 - project:
     templates:
@@ -446,29 +446,29 @@
         # aren't doing that either.
         - glance-tox-functional-oslo-tips:
             branches: master
-        - glance-tox-functional-py35-oslo-tips:
+        - glance-tox-functional-py36-oslo-tips:
             branches: master
         - glance-tox-py27-keystone-tips:
             branches: master
-        - glance-tox-py35-keystone-tips:
+        - glance-tox-py36-keystone-tips:
             branches: master
         - glance-tox-functional-keystone-tips:
             branches: master
-        - glance-tox-functional-py35-keystone-tips:
+        - glance-tox-functional-py36-keystone-tips:
             branches: master
         - glance-tox-py27-glance_store-tips:
             branches: master
-        - glance-tox-py35-glance_store-tips:
+        - glance-tox-py36-glance_store-tips:
             branches: master
         - glance-tox-functional-glance_store-tips:
             branches: master
-        - glance-tox-functional-py35-glance_store-tips:
+        - glance-tox-functional-py36-glance_store-tips:
             branches: master
         - glance-tox-py27-cursive-tips:
             branches: master
-        - glance-tox-py35-cursive-tips:
+        - glance-tox-py36-cursive-tips:
             branches: master
         - glance-tox-functional-cursive-tips:
             branches: master
-        - glance-tox-functional-py35-cursive-tips:
+        - glance-tox-functional-py36-cursive-tips:
             branches: master

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion = 2.3.1
-envlist = py35,functional-py35,py27,functional,pep8
+envlist = py36,functional-py36,py35,functional-py35,py27,functional,pep8
 skipsdist = True
 
 [testenv]
@@ -34,6 +34,10 @@ commands = ostestr --slowest {posargs}
 basepython = python3.5
 commands = ostestr --slowest {posargs}
 
+[testenv:py36]
+basepython = python3.6
+commands = ostestr --slowest {posargs}
+
 [testenv:py37]
 basepython = python3.7
 commands = ostestr --slowest {posargs}
@@ -55,6 +59,16 @@ whitelist_externals =
 commands =
   stestr run --blacklist-file ./broken-functional-py35-ssl-tests.txt {posargs}
 
+[testenv:functional-py36]
+basepython = python3.6
+setenv =
+  TEST_PATH = ./glance/tests/functional
+ignore_errors = True
+whitelist_externals =
+  bash
+commands =
+  stestr run --blacklist-file ./broken-functional-py35-ssl-tests.txt {posargs}
+
 [testenv:functional-py37]
 basepython = python3.7
 setenv =