Support MAC addresses in dhcp-host and dhcp-mac for DHCPv6.

src/option.c

@@ -2404,6 +2404,7 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
 #ifdef HAVE_DHCP6
 	else if (inet_pton(AF_INET6, a[0], &new->start6))
 	  {
+	    new->flags |= CONTEXT_V6; 
 	    new->prefix = 64; /* default */
 	    new->end6 = new->start6;
 	    new->next = daemon->dhcp6;