CBQE:0 Run on python27 for centos

Change-Id: I29758d81659723fb2328c882b7dc247141960b13
Reviewed-on: http://review.couchbase.org/38716
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Aruna Piravi <aruna@couchbase.com>