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
* Update requirements.txt to pin charm-tools to 2.8.3
* Update tox.ini to change the build parameters.
* This upgrades from <2.7 which adds reproducible charms
* Bug was fixed that controlled the default output directory
doesn't get 'builds' appended. The tox change puts it
back so that stable & master both build to the same
directory. This may be reviewed in the future.
* The cs:ubuntu charm used in the test has changed its behaviour
regarding the workload status message. The check in tests.yaml and in
the zaza test have been relaxed so that the workload status message is
not checked.