CBQE-927: printout known bugs in case of failure

in case of test failure the possible bug is put in conf file

Change-Id: I2da0b50ed948e79c3186387aae7dedcaffc4f658
Reviewed-on: http://review.couchbase.org/25021
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>