Log variables moved to log_manager.h

The log manager variables lm_enabled_log_files_bitmask, log_ses_count
and tls_log_info that earlier were declared separately in every
c-file are now declared in the log_manager.h header.

server/core/load_utils.c

@@ -51,11 +51,6 @@
 #include        <gw.h>
 #include        <gwdirs.h>
 
-/** Defined in log_manager.cc */
-extern int            lm_enabled_logfiles_bitmask;
-extern size_t         log_ses_count[];
-extern __thread log_info_t tls_log_info;
-
 static	MODULES	*registered = NULL;
 
 static MODULES *find_module(const char *module);