[CBD-1991]: Update healthchecker script for Jenkins job.

Change-Id: I28ad0b8f93e3b414192ce3a7a539124850eef8be
Reviewed-on: http://review.couchbase.org/33525
Reviewed-by: Philip Labee <philip@couchbase.com>
Reviewed-by: Eric Limare <eric.limare@couchbase.com>
Tested-by: Eric Limare <eric.limare@couchbase.com>