ovs-monitor-ipsec: Suppress "unknown %d argument" warning.

As 'ovs-vswitchd' does not understand IPsec tunnel options, it
gives a warning message. This can be safely suppressed.

Reported at: https://bugzilla.redhat.com/show_bug.cgi?id=1906701
Signed-off-by: Mark Gray <mark.d.gray@redhat.com>
Acked-by: Eelco Chaudron <echaudro@redhat.com>
Acked-by: Flavio Leitner <fbl@sysclose.org>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>

lib/netdev-vport.c

@@ -745,6 +745,14 @@ set_tunnel_config(struct netdev *dev_, const struct smap *args, char **errp)
                     goto out;
                 }
             }
+        } else if (!strcmp(node->key, "remote_cert") ||
+                   !strcmp(node->key, "remote_name") ||
+                   !strcmp(node->key, "psk")) {
+            /* When configuring OVS for IPsec, these keys may be set in the
+               tunnel port's 'options' column. 'ovs-vswitchd' does not directly
+               use them, but they are read by 'ovs-monitor-ipsec'. In order to
+               suppress the "unknown %s argument" warning message below, we
+               handle them here by ignoring them. */
         } else {
             ds_put_format(&errors, "%s: unknown %s argument '%s'\n", name,
                           type, node->key);