controller.cfg: updated terminology
controller.cfg: updated terminology

Updated the terminology within controller cfg from
master/slave to controller/worker

Signed-off-by: Lynn 'Cyrin' Conway <5b68ce331825ec082889a5af4f6beceed357d4a2@gmail.com>

denny820909/builder,denny820909/builder,denny820909/builder,denny820909/builder