gsyncd : Use --remote-host option during cli invocation

Required for unprivileged geo-replication sessions to
execute glusterd commands (which are however restricted).

Change-Id: Ib83b81defa061717f4465ffa665450d0f5d3d20d
BUG: 1077452
Signed-off-by: Venky Shankar <vshankar@redhat.com>
Reviewed-on: http://review.gluster.org/7833
Reviewed-by: Kotresh HR <khiremat@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>