PHPC-2008: Re-enable writeresult-getserver-002 for replicaset-auth (#1286)

MO should now grant the necessary roles as of mongodb-labs/mongo-orchestration@4e1ab40.

Author: jmikola

tests/replicaset/writeresult-getserver-002.phpt

@@ -2,7 +2,6 @@
 MongoDB\Driver\Server: Manager->getServer() returning correct server
 --SKIPIF--
 <?php require __DIR__ . "/../utils/basic-skipif.inc"; ?>
-<?php skip_if_auth(); /* TODO: PHPC-2008 */ ?>
 <?php skip_if_not_replica_set(); ?>
 <?php skip_if_no_secondary(); ?>
 <?php skip_if_not_clean(); ?>