afr:vol heal info fails when transport.socket.bind-address is set in glusterd

afr:vol heal info fails when transport.socket.bind-address is set in glusterd

Problem: If glusterd's bind address is specified using transport.socket.bind- address
option to a specific IP, the heal command 'gluster volume heal <VOLNAME> info' fails
with error '<vol_name>: Not able to fetch volfile from glusterd.Volume heal failed.'
This patch uses Unix domain socket transport type of libglfapi to get the volfile.

Change-Id: Ic4239b339f0246d77f1622c07d5f4708129d30c7
BUG: 1277997
Signed-off-by: Mohamed Ashiq <mliyazud@redhat.com>
Signed-off-by: Humble Devassy Chirammal <hchiramm@redhat.com>
Reviewed-on: http://review.gluster.org/12508
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Ravishankar N <ravishankar@redhat.com>
Tested-by: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: Niels de Vos <ndevos@redhat.com>
Reviewed-by: Anuradha Talur <atalur@redhat.com>
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>