glusterd: "volume heal info" doesn't report output properly

Problem: "volume heal info" doesn't reports files to be healed when gluster*
         processes on one of the storage node is not running

Change-Id: Iff7d41407014624e4da9b70d710039ac14b48291
BUG: 880898
Signed-off-by: Venkatesh Somyajulu <vsomyaju@redhat.com>
Reviewed-on: http://review.gluster.org/4371
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>