Bulk Operation

YARN-117 Add a set of final _init/_start/_stop methods to CompositeService

YARN-117 mark AbstractService init/start/stop methods as final

YARN-117 rename Service.register() and Service.unregister() to registerServiceListener() & unregisterServiceListener() respectively

YARN-117 Mark yarn.service package as public unstable

YARN-117 Delete FilterService

YARN-117 Define Service model strictly, implement AbstractService for robust subclassing, migrate yarn-common services

YARN-117 Make Yarn Client service shutdown operations robust

YARN-117 Make Yarn Node Manager services robust against shutdown

YARN-117 Make yarn Resource Manager services robust against shutdown

YARN-117 CompositeService should clone the Configurations it passes to children

YARN-117 Yarn services to throw a YarnException on invalid state changs

YARN-117 Make yarn-common services robust

YARN-117 Add support for static service lifecycle listeners .

YARN-117 Add ServiceOperations class to aid working with Services