SLIDER-296 ContainerReleaseSelectors have the job of choosing containers to release.
SLIDER-296 removing use of RoleHistory/nodemap target release selection logic
SLIDER-296 removing use of RoleHistory/nodemap target release selection logic - cutting methods out entirely
IDE-indicated import cleanup
SLIDER-296 providers now get notified of container create/release requests
Merge branch 'feature/SLIDER-296-AM_to_notify_containers_on_managed_container_release' into develop
Merge branch 'develop' of https://git-wip-us.apache.org/repos/asf/incubator-slider into develop