pycodestyle 2.40 and later enforce these rules that were not previously
enforced. Rather than just skipping them, this cleans up the trivial
instances of these violations.

This does also include some other updates that were not triggering errors
in an attempt to keep some of the style consistent.

Change-Id: Id7c0a6b8f1f835e69d844b000e3ed751852ada63
Closes-bug: #1762803

The current openstackclient implementation cannot accept 0
for --min-disk and --min-ram with the "openstack image set" command.
If theses options get set to 0, the option parser in openstackclient
wrongly interprets 0 as no option value. The 0 is valid for these
options if administrators want to make it the default(no minimum
requirements).

This patch fix the parser so that it avoids only 'None'.

Change-Id: Ie8ee37484c02c26f54adc56263fcd167c0ce7eb3
Closes-bug: #1719499

Added parser.add_mutually_exclusive_group() for --file and --volume
in openstack image create.

Change-Id: I4d9fc6314801d569354e5644e231ddd6c7f1853d
Closes-Bug: 1666551

The choices for valid container formats is out of date in the
image v1 and v2 help text.  This patch adds 'ova' and 'docker'
and does some minor refactoring to align the container_format
option with the disk_format option.

Change-Id: Icdea5fab801abd651baf45cf96c920c7df79f11b
Closes-bug: #1658138

Include option '--human-readable' to 'image show' command.
This option displays image size in human readable format
(such as K, M, G, T,..)

Related Commit: I0ef74c2ec978483fe49156c88acf5c369a8fa5c2
Closes-Bug: #1640086
Change-Id: I28cd5702925d51303d0607ed8dccf12c56434682

This format is used for containers for Virtuozzo hypervisor

Closes-Bug: 1650342

Change-Id: Ic79f29a1fe9ea5016d3d5520c2b06e39da01ff61

Use choices for image set and image create commands, this aligns
with our use of choices in networking commands.

Also update the help text to match that of the networking
commands, where we iterate through the options.

Related-Bug: 1635518
Change-Id: Ib4c66b06e07f1d4e5bfe1b74053f2215cccad890