[cubicweb-ctl] backport --dbglevel option of pyramid to all instance commands Closes #17219653

[cubicweb-ctl] backport --loglevel option of pyramid to all instance commands

[cubicweb-ctl/fix] correctly get exception traceback_ for pdb.post_mortem In python 3 the behavior of sys.exc_info had a very subtle change: - in python 2 you can call if whenever you want after a try/except statement and you'll get information about this last raise - ipython 3, once you get out of try/except, sys.exc_info is cleaned and you'll get (None, None, None) Hardened the test to avoid this error from happening again.