CBQE-1917 change standard bucket port
from 11214 (used by SSL proxy) to 11217
and centralize the change to one location
in testconstants.py

Change-Id: I7d148ac103bb35cfb57ba99219f10af5fda29a64
Reviewed-on: http://review.couchbase.org/32797
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Thuan Nguyen <soccon@gmail.com>