This patch adds functionality to configure server's description with:
1 server create
2 server set
3 server unset
4 server rebuild

Change-Id: Ic06d97b29e51828b29d7ac5172645c288e4ada9e
Story: 2002005
Task: 19640

This adds commands to import and export volume backup records so they
can be imported and restored on other Cinder instances or to the
original instance if the service or database has been lost and had to be
rebuilt.

I know this is a commonly used process by some users, so it would be
good to have this functionality in osc so they do not have to switch
clients.

More details about the export and import process can be found here:

https://docs.openstack.org/cinder/latest/admin/blockstorage-volume-backups-export-import.html

Change-Id: Ic95f87b36a416a2b50cb2193fd5759ab59336975
Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>

Change-Id: I6cf68325bc58cfd073c5fca4eb2773d108735399

The floatingip-disassociate mapping had 'port' instead of
'--port', also fixed a few places where 'unset' was missing
from some of the mappings.

Trivialfix

Change-Id: I3b01db28dda674e9988176d496154fbd26e4449f

Adds an equivalent for "cinder get-pools" with "volume backend pool list"
and "cinder get-pools --detail" with "volume backend pool list --long".

Story: 1655624
Task: 136949

Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>
Change-Id: I826c9946ffe11340d44ad57914f72fc2a72b6938

Adds and equivalend for "cinder get-capabilities" command to show the
capabilities supported by a Cinder backend.

Story: 1655624
Task: 26947

Change-Id: I38686a26cd503e45ce0102705a6632994ef10274
Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>

Word choice of description for "host-evacuate-live" is slightly
different from that in novaclient ("migrate of" instead of "migrate off").
https://github.com/openstack/python-novaclient/blob/master/doc/source/cli/nova.rst#nova-host-evacuate-live
They are supposed to be exactly the same, so use "migrate off" to
keep consistent.

Change-Id: Ie54c6ed83b6e9a3116e1832b3fb36dd80781366d