Enforce ordering of imports with H306.

For tests, this is mostly done by grouping test
imports after other cinderclient imports.

Change-Id: Ie40fda014d1aedb057e5b4ea1f27f999c84e6373

Added missing column 'Allocated' for
quota usage command.

Change-Id: Ic2656e2f849e834c7a576b0462d6e8a399a95006

Usage: It adds an optional argument --poll to the cinder
create command which waits while the creation of the volume
is completed and the volume goes to available state. In case
there is an error in volume creation, it throws an error message
and exits with a non zero status. The error message printed here
is the async error message in case it generates one.

Depends-On: Ic3ab32b95abd29e995bc071adc11b1e481b32516

Change-Id: I1a4d361d48a44a0daa830491f415be64f2e356e3

Support skip-validation parameter for quota update.

Change-Id: Iec4f1598987c632f45ad6eee751f78bedbf3ec26

Cinder doesn't support to update consistencygroup quota. And
since cg will be deprecated in Queue, there is no value to support it
at server or client side. So this patch removed it.

Change-Id: I5fbfb30611a60d575fedb676119bb0a1564700df
Closes-bug: #1693584

This bug for 'cinder message-list' has been fixed such that now
if the user gives wrong filters, then the command properly
prints WARNING message saying it is ignoring that filter. Previously,
for wrong filters which were not passed in the correct usage format,
the 'cinder message-list --filters' command was giving UnboundLocalError
exception.

The extract_filters() method was previously assuming that all the
message filters passed were in the format "<filter_name>=<value>",
because of which if the user passed something like:
	'cinder message-list --filters event_id:VOLUME_000002'
an UnboundLocalError was thrown.

The changes are made to the method such that if the user passes a
filter in invalid format, the cinder CLI ignores that filter while
providing the output.

Closes-Bug: #1696556

Change-Id: I545b3f28e545b380842ea003dc38ad70cb413aee

Introduce new command 'list-filters' to retrieve
enabled resource filters.

```
command: cinder list-filters --resource=volume

output:
+----------------+-------------------------------+
| Resource       | Filters                       |
+----------------+-------------------------------+
| volume         | name, status, image_metadata  |
+----------------+-------------------------------+

```

Also Added new option '--filters' to these list commands:
1. list
2. snapshot-list
3. backup-list
4. attachment-list
5. message-list
6. group-list
7. group-snapshot-list
8. get-pools

Change-Id: I062e6227342ea0d940a8333e84014969c33b49df
Partial: blueprint generalized-filtering-for-cinder-list-resource
Depends-On: 04bd22c1eb371805a3ce9f6c8915325bc0da2d36
Depends-On: 7fdc4688fea373afb85d929e649d311568d1855a