Update python testing as per zed cycle teting runtime

In Zed cycle, we have dropped the python 3.6/3.7[1] testing
and its support. Moving the py36 job to py3 based so that they run
on latest supported python 3. Updating the python classifier also to reflect the same.

[1] https://governance.openstack.org/tc/reference/runtimes/zed.html

Change-Id: Ida582daf7db6fb3cedb3c7e37fc512d094b37c6e

.zuul.yaml

@@ -54,13 +54,12 @@
       - name: openstack/python-cinderclient
 
 - job:
-    name: glance_store-tox-py36-cinder-tips
+    name: glance_store-tox-py3-cinder-tips
     parent: glance_store-tox-cinder-tips-base
     description: |
-      glance_store py36 unit tests vs. cinder masters
-    nodeset: ubuntu-bionic
+      glance_store py3 unit tests vs. cinder masters
     vars:
-      tox_envlist: py36
+      tox_envlist: py3
 
 - job:
     name: glance_store-tox-keystone-tips-base
@@ -73,13 +72,12 @@
       - name: openstack/python-keystoneclient
 
 - job:
-    name: glance_store-tox-py36-keystone-tips
+    name: glance_store-tox-py3-keystone-tips
     parent: glance_store-tox-keystone-tips-base
     description: |
-      glance_store py36 unit tests vs. keystone masters
-    nodeset: ubuntu-bionic
+      glance_store py3 unit tests vs. keystone masters
     vars:
-      tox_envlist: py36
+      tox_envlist: py3
 
 - job:
     name: glance_store-tox-oslo-tips-base
@@ -99,13 +97,12 @@
       - name: openstack/stevedore
 
 - job:
-    name: glance_store-tox-py36-oslo-tips
+    name: glance_store-tox-py3-oslo-tips
     parent: glance_store-tox-oslo-tips-base
     description: |
-      glance_store py36 unit tests vs. oslo masters
-    nodeset: ubuntu-bionic
+      glance_store py3 unit tests vs. oslo masters
     vars:
-      tox_envlist: py36
+      tox_envlist: py3
 
 - job:
     name: glance_store-tox-swift-tips-base
@@ -117,13 +114,12 @@
       - name: openstack/python-swiftclient
 
 - job:
-    name: glance_store-tox-py36-swift-tips
+    name: glance_store-tox-py3-swift-tips
     parent: glance_store-tox-swift-tips-base
     description: |
-      glance_store py36 unit tests vs. swift masters
-    nodeset: ubuntu-bionic
+      glance_store py3 unit tests vs. swift masters
     vars:
-      tox_envlist: py36
+      tox_envlist: py3
 
 - job:
     name: glance_store-src-ceph-tempest
@@ -153,7 +149,7 @@
     templates:
       - check-requirements
       - lib-forward-testing-python3
-      - openstack-python3-yoga-jobs
+      - openstack-python3-zed-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3
     check:
@@ -186,11 +182,11 @@
         # to define these jobs in the openstack/project-config repo.
         # That would make us less agile in adjusting these tests, so we
         # aren't doing that either.
-        - glance_store-tox-py36-cinder-tips:
+        - glance_store-tox-py3-cinder-tips:
             branches: master
-        - glance_store-tox-py36-keystone-tips:
+        - glance_store-tox-py3-keystone-tips:
             branches: master
-        - glance_store-tox-py36-oslo-tips:
+        - glance_store-tox-py3-oslo-tips:
             branches: master
-        - glance_store-tox-py36-swift-tips:
+        - glance_store-tox-py3-swift-tips:
             branches: master

releasenotes/notes/drop-python-3-6-and-3-7-41af87576c4fd7b1.yaml

@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    Python 3.6 & 3.7 support has been dropped. The minimum version of Python now
+    supported is Python 3.8.

setup.cfg

@@ -6,7 +6,7 @@ description_file =
 author = OpenStack
 author_email = openstack-discuss@lists.openstack.org
 home_page = https://docs.openstack.org/glance_store/latest/
-python_requires = >=3.6
+python_requires = >=3.8
 classifier =
     Development Status :: 5 - Production/Stable
     Environment :: OpenStack
@@ -18,8 +18,6 @@ classifier =
     Programming Language :: Python :: Implementation :: CPython
     Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.6
-    Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
 

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion = 3.1.1
-envlist = py39,py36,pep8
+envlist = py39,py38,pep8
 skipsdist = True
 ignore_basepython_conflict = True