Move ep-engine commit head forward on commit

Change-Id: Ibc925ebe3c4232f4027209ce3708f1e2980bb5fd
Reviewed-on: http://review.couchbase.org/23485
Reviewed-by: Michael Wiederhold <mike@couchbase.com>
Tested-by: Michael Wiederhold <mike@couchbase.com>

2.1-stable.xml

@@ -11,7 +11,7 @@
   </project>
 
   <project name="bucket_engine" path="bucket_engine" />
-  <project name="ep-engine" path="ep-engine" revision="a33607a72655e1f74c1a4edaa18614725e4d1f4a"/>
+  <project name="ep-engine" path="ep-engine" revision="fc9615cdebbf8028977fea5b3ebf7ebd6a0b9718"/>
   <project name="libconflate" path="libconflate" revision="branch-20"/>
   <project name="libmemcached" path="libmemcached" remote="membase" />
   <project name="libvbucket" path="libvbucket" />