Tested "find_resulce()" can find a backup by name or ID.
But some help messages and doc were "ID only", this patch
modify them.
Change-Id: I22dcc3a0b40f2bafabb6d26498158e2468037312
Cinder V2 API supports creating volume backup with "--force"
option. However, OSC doesn't support this argument. So this
patch add the "--force" option to allow users to back up a
in-use volume.
Change-Id: I326f8d6172b2830da4cf1317348af50142cc5490
Closes-Bug: #1596443
Previously each command logs take_action parameters explicitly
by using @utils.log_method decorator or log.debug().
Some commands have no logging.
This commit calls a logger in the base class and
drops all logging definition from individual commands.
Closes-Bug: #1532294
Change-Id: I43cd0290a4353c68c075bade9571c940733da1be
Added following commands for volume V2 API:
volume show
volume delete
volume type show
volume type delete
snapshot show
snapshot delete
backup show
backup delete
Implements: blueprint volume-v2
Change-Id: I68bd303c194f304ad15f899d335b72a8bf3ebe10