dhcp: Use chunk_hash_static() to calculate ID-based MAC addresses

testing/tests/ikev2/dhcp-static-mac/hosts/venus/etc/dhcp/dhcpd.conf

@@ -14,11 +14,11 @@ subnet 10.1.0.0 netmask 255.255.0.0 {
 }
 
 host carol {
-  hardware ethernet            7a:a7:8f:fc:db:3b;
+  hardware ethernet            7a:a7:51:cc:22:4a;
   fixed-address                10.1.0.30;
 }
 
 host dave {
-  hardware ethernet            7a:a7:35:78:bc:85;
+  hardware ethernet            7a:a7:93:70:2b:21;
   fixed-address                10.1.0.40;
 }