gluster: Remove unused defines and header include Remove the definitions of GLUSTER_FD_WRITE and GLUSTER_FD_READ which are no longer used. Also sockets.h isn't needed any more. Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com> Acked-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>