First, fix test_help(). A commit[1], which first appeared in Python
3.10, changes the output of the help feature of argparse. Options used
to be in a section named "Optional arguments:", and they are now in a
section named "Options:".

Second, tox 4 changes the behaviour of tox, and
{toxinidir}/requirements.txt is no longer installed automagically in the
docs virtual environment. This causes autodoc to fail on some imports.
We explicitely add {toxinidir}/requirements.txt to the list of
dependencies to fix this issue.

These issues should be fixed in separate patches, but since they both
block the CI, they depend on each other.

[1] https://github.com/python/cpython/pull/23858

Change-Id: Ia7866390b31f469bdea95624325a13aaf45a496e
Closes-Bug: #2002566

The repo is Python 3 now, so update hacking to version 3.0 which
supports Python 3.

Fix problems found.

Remove hacking and friends from lower-constraints, they are not needed
for installation.

Change-Id: I5ae47a7b11ff29a301e440c15daf30db7738485b

Prepare for the Image API v1 to be removed from glance during Rocky
by splitting the functional tests that hit v1 from the tests that hit
v2.  Introduce a new job that runs the functional-v1 tests against a
devstack running glance stable/queens, and configure this job for both
check and gate for the glanceclient.  The v2 functional tests
continue to be run for both check and gate against a devstack running
glance master.

Change-Id: Ifa98ada26a84e4cca3ea8c98173f61a6174cca27