CBQE-1119: minor changes in couchbase_clitest.py

Change-Id: Ic74e03e7bb6991537cb10903272270e3f423df5b
Reviewed-on: http://review.couchbase.org/26122
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>