mgmt/glusterd: display snapd status as part of volume status

* Made changes to save the port used by snapd in the info file for the volume
  i.e. <glusterd-working-directory>/vols/<volname>/info

This is how the gluster volume status of a volume would look like for which the
uss feature is enabled.

[root@tatooine ~]# gluster volume status vol
Status of volume: vol
Gluster process                                         Port    Online  Pid
------------------------------------------------------------------------------
Brick tatooine:/export1/vol                             49155   Y       5041
Snapshot Daemon on localhost                            49156   Y       5080
NFS Server on localhost                                 2049    Y       5087

Task Status of Volume vol
------------------------------------------------------------------------------
There are no active volume tasks

Change-Id: I8f3e5d7d764a728497c2a5279a07486317bd7c6d
BUG: 1111041
Signed-off-by: Raghavendra Bhat <raghavendra@redhat.com>
Reviewed-on: http://review.gluster.org/8114
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Kaushal M <kaushal@redhat.com>
mgmt/glusterd: use the right rpc for snapd while getting pending node rpc

* Also changed the testcase bug-1111041.t to correctly get the snapshot
  daemon's pid

Change-Id: I22c09a1e61f049f21f1886f8baa5ff421af3f8fa
BUG: 1111041
Signed-off-by: Raghavendra Bhat <raghavendra@redhat.com>
Reviewed-on: http://review.gluster.org/8209
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Sachin Pandit <spandit@redhat.com>
Reviewed-by: Kaushal M <kaushal@redhat.com>
Merge branch 'master' into better-peer-identification
Use gd_peer_has_address instead of strcmp

Change-Id: Ibe6eeff6a71401c6c6d7d8a48bf7c004b622e7e9