[CBD-1191]: Update healthchecker.

Change-Id: Ib6d6c0ecb02cdf7d985a42e3215784031ac8a05d
hange-Id: I7b0912791740d5954cb348a6ec85dfbee4db6a4b
Reviewed-on: http://review.couchbase.org/33682
Tested-by: Eric Limare <eric.limare@couchbase.com>
Reviewed-by: Philip Labee <philip@couchbase.com>
Reviewed-by: Eric Limare <eric.limare@couchbase.com>