MINOR: new srv_admin flag: SRV_ADMF_RMAINT

This flag has to be set when an IP address resolution fails (either
using libc at start up or using HAProxy's runtime resolver). This will
automatically trigger the administrative status "MAINT", through the
global mask SRV_ADMF_MAINT.
diff --git a/include/types/server.h b/include/types/server.h
index 19da2ad..57971a2 100644
--- a/include/types/server.h
+++ b/include/types/server.h
@@ -76,11 +76,12 @@
 enum srv_admin {
 	SRV_ADMF_FMAINT    = 0x01,        /* the server was explicitly forced into maintenance */
 	SRV_ADMF_IMAINT    = 0x02,        /* the server has inherited the maintenance status from a tracked server */
-	SRV_ADMF_MAINT     = 0x03,        /* mask to check if any maintenance flag is present */
+	SRV_ADMF_MAINT     = 0x23,        /* mask to check if any maintenance flag is present */
 	SRV_ADMF_CMAINT    = 0x04,        /* the server is in maintenance because of the configuration */
 	SRV_ADMF_FDRAIN    = 0x08,        /* the server was explicitly forced into drain state */
 	SRV_ADMF_IDRAIN    = 0x10,        /* the server has inherited the drain status from a tracked server */
 	SRV_ADMF_DRAIN     = 0x18,        /* mask to check if any drain flag is present */
+	SRV_ADMF_RMAINT    = 0x20,        /* the server is down because of an IP address resolution failure */
 };
 
 /* server-state-file version */