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>