Fix reverted osc-lib interface change
Fix reverted osc-lib interface change

The patch https://review.opendev.org/#/c/673389/ introduced a regression
by changing the osc-lib interface.

Two conflicting attempts to fix the regression were launched:

1) Reverting the patch.

2) The patch https://review.opendev.org/683119 changes the exception
   from the generic CommandError back to a specific Forbidden exception.

   The patch https://review.opendev.org/683118 catches this exception
   and passes on, i.e. re-implements the same behavior as before.

The first idea was implemented, the initial patch reverted. The second
idea was partially implemented. The change in python-openstackclient
(683118) was merged. The change in osc-lib was approved but failed to
merge because the initial change had been reverted.

Now we have again a situation where the exception produced in osc-lib
does not match the exception expected by the caller.

It is unclear if the osc-lib interface will ever get a rebased version
of https://review.opendev.org/683119 merged, so the safest way to
address the issue is to also catch the exception that used to be
thrown before the inital change and is again thrown after the inital
change has been reverted.

Change-Id: I2ea2def607ec5be112e42d53a1e660fef0cdd69c

openstack/python-openstackclient,openstack/python-openstackclient