Remove special ep-engine 2.1 manifest

Change-Id: I917cf3882c6d0c2d05b988db30e5d5a5221d6510
Reviewed-on: http://review.couchbase.org/27733
Reviewed-by: Michael Wiederhold <mike@couchbase.com>
Tested-by: Michael Wiederhold <mike@couchbase.com>