[CBD-1191]: Update healthchecker to resolve test error.

Change-Id: I18581fb13e57584b6eeaa88d3f731ea7b73ec841
Reviewed-on: http://review.couchbase.org/33688
Tested-by: Eric Limare <eric.limare@couchbase.com>
Reviewed-by: Philip Labee <philip@couchbase.com>
Reviewed-by: Eric Limare <eric.limare@couchbase.com>