Bump to 1.9.1 to match Swift version

Change-Id: I125db97e772b86cd51a45627c2fa23809e80878b
Signed-off-by: Peter Portante <peter.portante@redhat.com>
Reviewed-on: http://review.gluster.org/5702
Reviewed-by: Luis Pabon <lpabon@redhat.com>
Tested-by: Luis Pabon <lpabon@redhat.com>