CBQE-0: add known bugs in py-newupgrade.conf

Change-Id: I7bf4b6b90aca6e8b403cf4f3f79d8c947621184b
Reviewed-on: http://review.couchbase.org/26742
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>