confd: initctl touch mcd after querier changes

Prior to this commit, querier multicast changes such as query-interval
where not applied to an existing multicast interface. The new initctl
touch makes finit send a sighup to mcd which causes it to re-load its
configuration files.

Signed-off-by: Richard Alpe <[email protected]>

src/confd/src/ietf-interfaces.c

@@ -1128,6 +1128,7 @@ static void mcast_querier(const char *ifname, int vid, int mode, int interval)
 	fclose(fp);
 
 	systemf("initctl -bnq enable mcd");
+	systemf("initctl -bnq touch mcd");
 }
 
 static char *find_vlan_interface(sr_session_ctx_t *session, const char *brname, int vid)