MXS-2012 Write replication lag to SERVER

Allows routers to read the value.

include/maxscale/server.h

@@ -49,6 +49,10 @@ const int MAINTENANCE_NO_CHANGE = 0;
 const int MAINTENANCE_ON = 100;
 const int MAINTENANCE_FLAG_NOCHECK = 0;
 const int MAINTENANCE_FLAG_CHECK = -1;
+
+// Default replication lag value
+const int MXS_RLAG_UNDEFINED = -1;
+
 /**
  * The server parameters used for weighting routing decissions
  */
@@ -158,12 +162,6 @@ typedef struct server
     MxsDiskSpaceThreshold* disk_space_threshold; /**< Disk space thresholds */
 } SERVER;
 
-enum
-{
-    MAX_RLAG_NOT_AVAILABLE = -1,
-    MAX_RLAG_UNDEFINED = -2
-};
-
 /**
  * Status bits in the SERVER->status member, which describes the general state of a server. Although the
  * individual bits are independent, not all combinations make sense or are used. The bitfield is 64bits wide.