ceph-disk: list accepts absolute dev names

ceph-disk: list accepts absolute dev names

The ceph-disk list subcommand now accepts /dev/sda as well as sda.
The filtering is done on the full list of devices instead of restricting
the number of devices explored. Always obtaining the full list of
devices makes things simpler when trying to match a dmcrypted device to
the corresponding raw device.

Signed-off-by: Loic Dachary <loic@dachary.org>
(cherry picked from commit 591d581c84cfd72d7c655ac88b0911a318b96e95)

Conflicts:
	src/ceph-disk: as part of the implementation of deactivate /
	destroy in master, the prototype of list_device was changed
        to take a list of paths instead of the all arguments (args).