Add map reduce job for contact import

Some additional changes were made by Ben McIlwain.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=133875824

java/google/registry/env/common/backend/WEB-INF/web.xml

@@ -275,6 +275,12 @@
     <url-pattern>/_dr/task/expandRecurringBillingEvents</url-pattern>
   </servlet-mapping>
 
+  <!-- Mapreduce to import contacts from escrow file -->
+  <servlet-mapping>
+    <servlet-name>backend-servlet</servlet-name>
+    <url-pattern>/_dr/task/importRdeContacts</url-pattern>
+  </servlet-mapping>
+
   <!-- Security config -->
   <security-constraint>
     <web-resource-collection>