New implementation of the project cleanup based on the sdk.project_cleanup.
It is implemented as an additional OSC operation and will ideally obsolete the 
`openstack project purge` giving flexibility to extend services support, 
parallelization, filters, etc.

Change-Id: Ie08877f182379f73e5ec5ad4daaf84b3092c829c

openstack-client doesn’t support the upload progress bar.

This patch shows progressbar when create image
if you added '--progress' option like a python-glanceclient.

like this.
[=============================>] 100%
+------------------+---------------------------+
| Field            | Value                     |
+------------------+---------------------------+
| container_format | bare                      |
| created_at       | 2020-09-06T20:44:40Z      |
...

How to use
Add the'--progress' option on the 'openstack image create' command.

Code was written by referring to 'python-glanceclient' project
on stable/ussuri branch

Change-Id: Ic3035b49da10b6555066eee607a14a5b73797c00
task: 40003
story: 2007777

SDK starts caching token in keyring (when available and configured). A
small change is required in OSC not to reject this state.
Overall this helps avoiding reauthentication upon next openstack call.
If token is not valid anymore automatically reauthentication is done.

Depends-On: https://review.opendev.org/c/openstack/openstacksdk/+/735352
Depends-On: https://review.opendev.org/c/openstack/osc-lib/+/765650
Change-Id: I47261a32bd3b106a589974d3de5bf2a6ebd57263

With python3.x, classes can use 'metaclass=' instead of
'six.add_metaclass', 'six.iteritems' and 'six.iterkeys' can
be replaced by 'items' and 'keys', 'six.moves.urllib.parse'
can be replaced by 'urllib.parse', 'six.StringIO' and
'six.moves.cStringIO' can be replaced by 'io.StringIO',
'six.text_type' and 'six.string_type' are just 'str'.

Change-Id: I84848c0bf8ab3c36dd821141191e2725e4e3b58b

Since the openstack SDK still has the neutron-lbaas entries in the network quota,
but those are already deprecated [1], the 'opentack quota show' command shows those
as None value.
This fix removes those empty deprecated values from the output.

[1] https://review.opendev.org/#/c/658494/
Change-Id: I8dbdba2a029ea8e6a268ddf29627e1466a7e3a8a

The offending entry point object looks like:
EntryPoint(name='compute', value='openstackclient.compute.client',
group='openstack.cli.base')

Story: 2007917
Task: 40323
Change-Id: I0f3cc62e23efdc14203ce6645581d5ba5dbf7fa0