Remove listmanager code

The code prevented scaling by imposing global spinlocks for the DCBs and
SESSIONs. Removing this list means that a thread-local list must be taken
into use to replace it.

server/core/config.c

@@ -702,10 +702,6 @@ config_load(const char *filename)
 {
     ss_dassert(!config_file);
 
-    /* Temporary - should use configuration values and test return value (bool) */
-    dcb_pre_alloc(1000);
-    session_pre_alloc(250);
-
     global_defaults();
     feedback_defaults();