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/modules/routing/maxinfo/maxinfo.c

@@ -63,11 +63,6 @@ MODULE_INFO 	info = {
 	"The MaxScale Information Schema"
 };
 
-/** 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;
-
 extern char *create_hex_sha1_sha1_passwd(char *passwd);
 
 static char *version_str = "V1.0.0";