Fails in autopkgtest with python3.11

openstack-trove currently fails in autopkgtest when triggered with python 3.11, such as seen at https://autopkgtest.ubuntu.com/results/autopkgtest-lunar/lunar/amd64/o/openstack-trove/20230126_012539_e9a11@/log.gz

I believe there are 2 reasons for this failure:

1) Message on stderr related to pipes deprecation

autopkgtest [01:13:15]: test trove-daemons: [-----------------------
/usr/bin/crudini:20: DeprecationWarning: 'pipes' is deprecated and slated for removal in Python 3.13
  import pipes
autopkgtest [01:13:19]: test trove-daemons: -----------------------]
trove-daemons FAIL non-zero exit status 1
autopkgtest [01:13:20]: test trove-daemons: - - - - - - - - - - results - - - - - - - - - -
autopkgtest [01:13:20]: test trove-daemons: - - - - - - - - - - stderr - - - - - - - - - -
/usr/bin/crudini:20: DeprecationWarning: 'pipes' is deprecated and slated for removal in Python 3.13
  import pipes

So either fixing the deprecation, suppressing stderr, or adding allow-stderr should suffice.
(Unrelated - I believe this test wants restriction isolation-container)

2) AttributeError: module 'inspect' has no attribute 'getargspec'

When I experimented with adding the allow-stderr restriction, I found that the test still failed.
If one runs the trove-manage db_sync step without redirection outputs to /dev/null, we get some useful info:
+ su -s /bin/sh -c 'python3.11 /usr/bin/trove-manage db_sync' trove
Command failed, please check log for more info.
root [-] Unhandled error: AttributeError: module 'inspect' has no attribute 'getargspec'
root Traceback (most recent call last):
root File "/usr/bin/trove-manage", line 10, in <module>
root sys.exit(main())
root ^^^^^^
root File "/usr/lib/python3/dist-packages/trove/cmd/manage.py", line 390, in main
root Commands().execute()
root File "/usr/lib/python3/dist-packages/trove/cmd/manage.py", line 49, in execute
root args = inspect.getargspec(exec_method)
root ^^^^^^^^^^^^^^^^^^
root AttributeError: module 'inspect' has no attribute 'getargspec'
root
(timestamps trimmed from this log for readability)