change healthchecker to 829e18598bfef537263c0cf014420d499a467a7d from master
to fix compile errors in 2.5.0 builds

Change-Id: I13e294a1bc667630d8987f9d02dbad4e3c3bb2c9
Reviewed-on: http://review.couchbase.org/30480
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>