gsyncd / geo-rep: Mountbroker cli to use INET sockets

unprivileged geo-replication session runs the slave gsyncd
process as unprivileged, thereby executing gluster cli commands
as an unprivileged user. By default, cli to glusterd
uses unix domain sockets, thereby restricting cli command
execution by non root users.

This patch introduces '--remote-host' cli option to force
cli to use INET socket. For this to work, the following
needs to be added in glusterd volfile

      option rpc-auth-allow-insecure on

Change-Id: I84b1711281bbcbde156200f80ebdb065afb55488
BUG: 1077452
Signed-off-by: Venky Shankar <vshankar@redhat.com>
Reviewed-on: http://review.gluster.org/7820
Tested-by: Gluster Build System <jenkins@build.gluster.com>