MB-11509: copy (possibly updated) couchdb.plt back to workspace root so Jenkins can save it
Change-Id: I602195a5baac925a1f4acf410832684c98861b17
Reviewed-on: http://review.couchbase.org/38729
Reviewed-by: Chris Hillery <ceej@couchbase.com>
Tested-by: Chris Hillery <ceej@couchbase.com>