glusterd: Set the rlimit for Open FDs to higher value

Default 'open FD limit' is 1024. As the number of volumes/bricks
increases, brick-to-glusterd socket FDs also increases in glusterd and
runs out of the limit.

Solution is to set the 'Open FD' limit to higher value in glusterd

Change-Id: Iaa60b2155df2fa5a0759e054bdebffbc09f63ec1
BUG: 1136352
Signed-off-by: Vijaikumar M <vmallika@redhat.com>
Reviewed-on: http://review.gluster.org/8578
Reviewed-by: Rajesh Joseph <rjoseph@redhat.com>
Reviewed-by: Atin Mukherjee <amukherj@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Krishnan Parthasarathi <kparthas@redhat.com>
Tested-by: Krishnan Parthasarathi <kparthas@redhat.com>