Sanitize EPP XML requests and responses

Masks user credentials (tags 'pw' and 'newPW') in EPP XML messages.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=207953894

java/google/registry/flows/FlowRunner.java

@@ -54,7 +54,7 @@ public class FlowRunner {
 
   /** Runs the EPP flow, and records metrics on the given builder. */
   public EppOutput run(final EppMetric.Builder eppMetricBuilder) throws EppException {
-    String prettyXml = prettyPrint(inputXmlBytes);
+    String prettyXml = prettyPrint(EppXmlSanitizer.sanitizeEppXml(inputXmlBytes));
 
     logger.atInfo().log(
         COMMAND_LOG_FORMAT,