staging:lustre: remove useless libcfs_sock_abort_accept

Another one of those silly one line wrappers which is not
needed. Replace libcfs_sock_abort_accept wrapper with a
direct call to wake_up_all on the lnet_acceptor_state sock.

Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>