A DynamicLookupCommand exiting with 10 is treated like an empty server stanza.

This way a script can signal "not found".

The naptr-eduroam.sh and radsec-dynsrv.sh scripts are changed to
behave like this.

Closes RADSECPROXY-22.

radsecproxy.c

@@ -2273,8 +2273,14 @@ int dynamicconfig(struct server *server) {
     }
 
     if (status) {
-	debug(DBG_INFO, "dynamicconfig: command exited with status %d", WEXITSTATUS(status));
-	goto errexit;
+	if (WEXITSTATUS(status) == 10) {
+	    debug(DBG_INFO, "dynamicconfig: command signals empty config");
+	}
+	else {
+	    debug(DBG_INFO, "dynamicconfig: command exited with status %d",
+		  WEXITSTATUS(status));
+	    goto errexit;
+	}
     }
 
     if (ok)

tools/naptr-eduroam.sh

@@ -70,4 +70,4 @@ if [ -n "${SERVERS}" ]; then
     exit 0
 fi
 
-exit 0
+exit 10				# No server found.

tools/radsec-dynsrv.sh

@@ -48,4 +48,4 @@ if test -n "${SERVERS}" ; then
         exit 0
 fi
 
-exit 0
+exit 10				# No server found.