Add ::1 to allowed_hosts for IPv6 connections.

sample-config/nrpe.cfg.in

@@ -95,7 +95,7 @@ nrpe_group=@nrpe_group@
 #
 # NOTE: This option is ignored if NRPE is running under either inetd or xinetd
 
-allowed_hosts=127.0.0.1
+allowed_hosts=127.0.0.1,::1