Remove py 3.6 support and update jobs

Although we're not on the OpenStack release schedule as such, Zed
cycle is dropping 3.6/3.7 support.  This means it seems like as good a
time as any to also update ourselves to this regime.  One important
dependency to think about is nodepool, but that is already >3.8 only
so we will be in sync there.

This also changes dib jobs to run using the zed template and adapts
the bindep file to handle Ubuntu Jammy.

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

Change-Id: Ibdbcf459608711ac64e7fefb1707f6708d68e750
Co-Authored-By: Jay Faulkner <jay@jvf.cc>
Co-Authored-By: Jens Harbott <frickler@offenerstapel.de>
Co-Authored-By: Ian Wienand <iwienand@redhat.com>

.zuul.d/project.yaml

@@ -7,7 +7,7 @@
       # NOTE(ianw): 2020-05-29 jobs are unstable; see
       # https://bugs.launchpad.net/tripleo/+bug/1879766
       - tripleo-buildimage-jobs-centos-8
-      - openstack-python3-wallaby-jobs
+      - openstack-python3-zed-jobs
     check:
       jobs:
         - openstack-tox-pylint

bindep.txt

@@ -14,17 +14,17 @@ git
 
 squashfs-tools [!platform:suse]
 squashfs [platform:suse]
-zypper [!platform:debian-stretch !platform:redhat !platform:ubuntu-trusty !platform:ubuntu-bionic !platform:ubuntu-focal]
+zypper [!platform:debian-stretch !platform:redhat !platform:ubuntu-trusty !platform:ubuntu-bionic !platform:ubuntu-focal !platform:ubuntu-jammy]
 gnupg2 [!platform:redhat !platform:ubuntu-trusty !platform:suse]
 
 # ubuntu
 apt-transport-https [platform:dpkg]
 inetutils-ping [platform:dpkg]
-python-lzma [platform:dpkg !platform:ubuntu-focal !platform:debian-bullseye]
+python-lzma [platform:dpkg !platform:ubuntu-focal !platform:ubuntu-jammy !platform:debian-bullseye]
 qemu-utils [platform:dpkg]
 rpm [platform:dpkg]
 uuid-runtime [platform:dpkg]
-yum-utils [platform:dpkg !platform:ubuntu-focal !platform:debian-bullseye]
+yum-utils [platform:dpkg !platform:ubuntu-focal !platform:ubuntu-jammy !platform:debian-bullseye]
 dnf [platform:debian-bullseye]
 debootstrap [platform:dpkg]
 zstd [platform:dpkg]

releasenotes/notes/python-3.8-b401ad4f2bbbc99f.yaml

@@ -0,0 +1,3 @@
+---
+upgrade:
+  - This release removes support for Python releases before 3.8

setup.cfg

@@ -12,12 +12,10 @@ classifier =
     License :: OSI Approved :: Apache Software License
     Operating System :: POSIX :: Linux
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.6
-    Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
     Environment :: Console
-python_requires = >=3.6
+python_requires = >=3.8
 
 [files]
 packages =