Allow using pull-replication on replica nodes Gerrit replica nodes do not bind the REST-API servlet: the standard binding of the pull-replication API would not work at all. Define on replica node a special servlet filter that is filtering exactly the pull-replication API and serves exactly the same content in the same way. Bug: Issue 14982 Change-Id: Ifa148c4865527b67260e7d4bb1c91d1472512af9