CBQE-0: fix getcoredumps.py

example output https://friendpaste.com/1QSfeMqI01nwaWgz8w1tWu

Change-Id: Icf948005bc5ae4ea69f7ad481a4978a983918a37
Reviewed-on: http://review.couchbase.org/37314
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>