dlm: keep lkbs in idr

This is simpler and quicker than the hash table, and
avoids needing to search the hash list for every new
lkid to check if it's used.

Signed-off-by: David Teigland <teigland@redhat.com>

fs/dlm/config.h

@@ -20,7 +20,6 @@ struct dlm_config_info {
 	int ci_tcp_port;
 	int ci_buffer_size;
 	int ci_rsbtbl_size;
-	int ci_lkbtbl_size;
 	int ci_dirtbl_size;
 	int ci_recover_timer;
 	int ci_toss_secs;