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

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

Importing pkg_resources scans every installed distribution to find
all of the entry points. Stevedore is adding a new caching layer using
importlib.metadata, which will not.  Switching to the stevedore should
eventually speed up load times, especially for command line apps. This
change makes the switch now to ensure API compatibility.

We were already using stevedore for tests, so this moves the dependency
from test-requirements.txt to requirements.txt and raises the minimum
version to something more recent.

Change-Id: I3e3632783bc745979b6db73e610df8a77ffaceb0
Signed-off-by: Doug Hellmann <doug@doughellmann.com>