cli: add peerid to volume status xml output

This patch adds <peerid> tag to bricks and nfs/shd like services to
volume status xml output.

BUG: 955548
Change-Id: I9aaa9266e4d56f632235eaeef565e92d757c0694
Signed-off-by: Bala.FA <barumuga@redhat.com>
Reviewed-on: http://review.gluster.org/6162
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Kaushal M <kaushal@redhat.com>