fix(rest) refactored delete jobs by execution

Conflicts:
	engine-rest/src/main/java/org/camunda/bpm/engine/rest/dto/job/JobDeleteMessageDto.java
	engine-rest/src/main/java/org/camunda/bpm/engine/rest/sub/runtime/ExecutionResource.java
	engine-rest/src/main/java/org/camunda/bpm/engine/rest/sub/runtime/impl/ExecutionResourceImpl.java