BUG/MINOR: server: Remove RMAINT from admin state when loading server state

The RMAINT admin state is dynamic and should be remove from the
srv_admin_state parameter when a server state is loaded from a server-state
file. Otherwise an erorr is reported, the server-state line is ignored and
the server state is not updated.

This patch should fix the issue #576. It must be backported as far as 1.8.
diff --git a/src/server.c b/src/server.c
index 36eceb5..da6ee52 100644
--- a/src/server.c
+++ b/src/server.c
@@ -2677,7 +2677,7 @@
 		/* inherited statuses will be recomputed later.
 		 * Also disable SRV_ADMF_HMAINT flag (set from stats socket fqdn).
 		 */
-		srv_admin_state &= ~SRV_ADMF_IDRAIN & ~SRV_ADMF_IMAINT & ~SRV_ADMF_HMAINT;
+		srv_admin_state &= ~SRV_ADMF_IDRAIN & ~SRV_ADMF_IMAINT & ~SRV_ADMF_HMAINT & ~SRV_ADMF_RMAINT;
 
 		if ((p == params[2]) || errno == EINVAL || errno == ERANGE ||
 		    (srv_admin_state != 0 &&