cli: Add brick operation fails from ovirt-shell(#923169)

Duplicate bricks are send when --brick-brick option is
specified for add brick operation.

Change-Id: Ia42557b26dbaacb0a00da461e07dae60fee4ae5e
Bug-Url: https://bugzilla.redhat.com/923169
Signed-off-by: Ravi Nori <rnori@redhat.com>