socket: Make non-ssl sockets perform non-blocking connect()

Change-Id: Icb60cf7ad3ea7ca0eeb12fd19b95a6b340857bb2
BUG: 920916
Signed-off-by: Krishnan Parthasarathi <kparthas@redhat.com>
Reviewed-on: http://review.gluster.org/4685
Reviewed-by: Jeff Darcy <jdarcy@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>