Derive RDAP link paths from the received query

The former method -- a config string -- was cumbersome, as each Nomulus system would have to configure the link base to its own URL.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=173567021

java/google/registry/rdap/RdapAutnumAction.java

@@ -53,7 +53,7 @@ public class RdapAutnumAction extends RdapActionBase {
 
   @Override
   public ImmutableMap<String, Object> getJsonObjectForResource(
-      String pathSearchString, boolean isHeadRequest, String linkBase) {
+      String pathSearchString, boolean isHeadRequest) {
     throw new NotImplementedException("Domain Name Registry information only");
   }
 }