Read from bloom filter for premium pricing checks

This also cleans up the PremiumList API so that it only has one
method for checking premium prices, which is by TLD, rather than two.

I will be refactoring a lot of the static methods currently residing in
the PremiumList class into a separate utils class, but I don't want to
include too many changes in this one CL.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=148475345

java/google/registry/tools/DeletePremiumListCommand.java

@@ -62,9 +62,6 @@ final class DeletePremiumListCommand extends ConfirmingCommand implements Remote
   @Override
   protected String execute() throws Exception {
     premiumList.delete();
-    return String.format(
-        "Deleted premium list %s with %d entries.\n",
-        premiumList.getName(),
-        premiumList.getPremiumListEntries().size());
+    return String.format("Deleted premium list '%s'.\n", premiumList.getName());
   }
 }