Use python job template for Zed

... because the current master should be compatible with the Zed
release of the other projects. This effectively removes testing on
Python 3.6 and only Python 3.8 and 3.9 will be tested.

Python 3.6 and 3.7 are removed form classifiers because these are no
longer supported.

Related-Bug: #1974244
Change-Id: I7fd253cf0c7d09ca3c4ce9b5d069e4c75a985b68

setup.cfg

@@ -6,7 +6,7 @@ description_file =
 author = OpenStack
 author_email = openstack-discuss@lists.openstack.org
 home_page = https://docs.openstack.org/tripleo-common/latest/
-python_requires = >=3.6
+python_requires = >=3.8
 classifier =
     Environment :: OpenStack
     Intended Audience :: Information Technology
@@ -17,8 +17,6 @@ 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
 

zuul.d/cross-jobs.yaml

@@ -1,7 +1,7 @@
 - job:
-    name: tripleo-cross-tripleoclient-py37
-    parent: openstack-tox-py37
-    description: Run cross-project tests on tripleoclient from HEAD with py37
+    name: tripleo-cross-tripleoclient-py39
+    parent: openstack-tox-py39
+    description: Run cross-project tests on tripleoclient from HEAD with py39
     vars:
       zuul_work_dir: src/opendev.org/openstack/python-tripleoclient
     required-projects:

zuul.d/layout.yaml

@@ -2,7 +2,7 @@
     templates:
       - check-requirements
       - openstack-cover-jobs
-      - openstack-python3-yoga-jobs
+      - openstack-python3-zed-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3
       - tripleo-multinode-container-minimal-pipeline
@@ -15,16 +15,10 @@
     check:
       jobs:
         - openstack-tox-linters
-        - openstack-tox-py36
-        - openstack-tox-py37
-        - openstack-tox-py38
-        - openstack-tox-py39
-        - tripleo-cross-tripleoclient-py37
+        - tripleo-cross-tripleoclient-py39
         - tripleo-ci-centos-9-content-provider:
             dependencies: &deps_unit_lint
               - openstack-tox-linters
-              - openstack-tox-py36
-              - openstack-tox-py37
               - openstack-tox-py39
         - tripleo-buildimage-overcloud-full-centos-9:
             dependencies: *deps_unit_lint
@@ -37,6 +31,5 @@
     gate:
       queue: tripleo
       jobs:
-        - openstack-tox-py37
         - openstack-tox-linters
-        - tripleo-cross-tripleoclient-py37
+        - tripleo-cross-tripleoclient-py39