CBQE-0: fix py-epenginesanity.conf for 3 nodes ini file

Change-Id: I567af2cd1962b5e9d4e2ee9c98d68a423eb93ada
Reviewed-on: http://review.couchbase.org/41608
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>