MB-8185: Add healthchecker to release package

Change-Id: I1bd58a6fff0b24d5dccf93a1ab4289e9e3b8cf49
Reviewed-on: http://review.couchbase.org/26121
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>