* use stable/21.10 libraries
* use zaza/zaza-openstack-tests at stable/21.10
* build.lock files for reactive charms
* bundles refer to ~openstack-charms candidate channel
* update tox/pip.sh to ensure setuptools<50.0.0
The 'hirsute' key in c-h/core/host_factory/ubuntu.py:
UBUNTU_RELEASES had been missed out, and is needed for
hirsute support in many of the charms. This sync is to
add just that key. See also [1]
21.04 libraries freeze for charms on master branch
* charm-helpers sync for classic charms
* build.lock file for reactive charms
* ensure tox.ini is from release-tools
* ensure requirements.txt files are from release-tools
* On reactive charms:
- ensure stable/21.04 branch for charms.openstack
- ensure stable/21.04 branch for charm-helpers