dhcp: downgrade "got raw socket fd" message to log3, make log2 default max

log3 messages are very much redundant

function                                             old     new   delta
change_listen_mode                                   322     302     -20

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/networking/udhcp/d6_dhcpc.c b/networking/udhcp/d6_dhcpc.c
index 02766ba..422b888 100644
--- a/networking/udhcp/d6_dhcpc.c
+++ b/networking/udhcp/d6_dhcpc.c
@@ -981,7 +981,7 @@
 	log2("opening raw socket on ifindex %d", ifindex);
 
 	fd = xsocket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IPV6));
-	log2("got raw socket fd %d", fd);
+	log3("got raw socket fd %d", fd);
 
 	memset(&sock, 0, sizeof(sock)); /* let's be deterministic */
 	sock.sll_family = AF_PACKET;