8681b023 changed the signature of _login but did not update the
policyd test. This was not immediately picked up because the
policyd test is skipped before groovy due to Bug #1880959
Closes-Bug: #1911923
Add Python 3.8 env in Travis CI test matrix.
At present the pinning of flake8 disallows running of lint on
Python 3.8 systems.
Update flake8 ignore-list to ignore W504 instead of W503, the PEP
guidance is that either is ok, but there must be local consistency.
There are more occurences of binary operator before line-break
than after in this repository, and we have also chosen to ignore
W504 in most of our other repositories.
The difference in how openstack-dashboard and every other service uses
policies continues to create special cases. This set of fixes deals
with some more of those differences.
* Addition of the (incomplete) openstack-dashboard test.
* Modification of other charm policyd override tests to support
multi-file policy overrides resource ZIP.
