shell: Correctly link to encrypted block devices

Fixes #1262
Closes #1286
Reviewed-by: Stef Walter <stefw@redhat.com>
daemon: Expose Block.DeviceNumber

Reviewed-by: Stef Walter <stefw@redhat.com>
shell: Improve storage sort orders

Block devices are now sorted numerically by their device numbers so
that things like "hd10" come after "hd9" and not before.  Other sort
orders have not really changed, but the reliance on D-Bus object paths
has been removed.

Fixes #1210
Closes #1291
Reviewed-by: Stef Walter <stefw@redhat.com>