charon-cmd: Use %any as local address so IPv4 is not preferred

When resolving the remote host, we first determine if a particular
address family is preferred locally.  With `0.0.0.0` that's IPv4, with
`%any` that's not the case.  So we use the latter to allow resolvers
to return an IPv6 address.

src/charon-cmd/cmd/cmd_connection.c

@@ -150,7 +150,7 @@ static peer_cfg_t* create_peer_cfg(private_cmd_connection_t *this)
 	peer_cfg_t *peer_cfg;
 	proposal_t *proposal;
 	ike_cfg_create_t ike = {
-		.local = "0.0.0.0",
+		.local = "%any",
 		.remote = this->host,
 		.remote_port = IKEV2_UDP_PORT,
 		.fragmentation = FRAGMENTATION_YES,