core : Use correct path in dlopen for socket.so

core : Use correct path in dlopen for socket.so

This patch fixes the path for socket.so file while loading the so dynamically.
Also for config.memory-accounting & config.transport voltype is changed to
glusterd to fix the warning message coming from xlator_volopt_dynload

Change-Id: I0f7964814586f2018d4922b23c683f4e1eb3098e
BUG: 1283485
Signed-off-by: Atin Mukherjee <amukherj@redhat.com>
Reviewed-on: http://review.gluster.org/12656
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Niels de Vos <ndevos@redhat.com>
Reviewed-by: Jeff Darcy <jdarcy@redhat.com>