update job template to zed

This change updates the python job template to zed
this will disable py36 jobs and enable the default set
for zed. The repo presently used the yoga template
which now fails as a result of project dropping py36 support.

This change also increases the min python reqired to 3.8
to match the zed supported runtimes and adds a release note.

Change-Id: I50253be0c99df9b363da5f6cc0c8502536dbbb43

.zuul.yaml

@@ -160,7 +160,7 @@
     templates:
       - check-requirements
       - openstack-lower-constraints-jobs
-      - openstack-python3-yoga-jobs
+      - openstack-python3-zed-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3
       - openstack-cover-jobs

releasenotes/notes/drop-py36-support-0e9b07073f6ad73f.yaml

@@ -0,0 +1,8 @@
+---
+other:
+  - |
+    The yoga release of OpenStack was the final release to support python 3.6
+    as a result os-vif has now dropped support for python 3.6. The final release
+    of os-vif to support python 3.6 was 2.8.0. os-vif now requires python 3.8
+    and is tested with 3.8, 3.9 and 3.10. newer versions may work but will
+    not be tested in the zed cycle.

setup.cfg

@@ -5,7 +5,7 @@ description_file = README.rst
 author = OpenStack
 author_email = openstack-discuss@lists.openstack.org
 home_page = https://docs.openstack.org/os-vif/latest/
-python_requires = >=3.6
+python_requires = >=3.8
 classifier =
     Environment :: OpenStack
     Intended Audience :: Information Technology
@@ -15,10 +15,9 @@ classifier =
     Programming Language :: Python
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3 :: Only
-    Programming Language :: Python :: 3.6
-    Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.10
     Programming Language :: Python :: Implementation :: CPython
 
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