Remove account name from being saved in the object

Instead we save the account in the a list, where the
index to the account is the partition number.

Change-Id: Ie4abefee48a3b237306a1e301ffa798e24e3f1db
Signed-off-by: Luis Pabon <lpabon@redhat.com>
Reviewed-on: http://review.gluster.org/5120
Reviewed-by: Peter Portante <pportant@redhat.com>
Tested-by: Peter Portante <pportant@redhat.com>