Don't include "Command" suffix in WHOIS metrics command name label

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=152414152

javatests/google/registry/whois/WhoisHttpServerTest.java

@@ -352,7 +352,7 @@ public class WhoisHttpServerTest {
     server.run();
     WhoisMetric expected =
         WhoisMetric.builderForRequest(clock)
-            .setCommandName("NameserverLookupByHostCommand")
+            .setCommandName("NameserverLookupByHost")
             .setNumResults(1)
             .setStatus(SC_OK)
             .build();