1) Unfinished jobs that are yet to be processed.
2) Completed jobs
The jobs that are in process, will be skipped by the expunge thread
Conflicts:
server/src/com/cloud/async/dao/AsyncJobDao.java
server/src/com/cloud/async/dao/AsyncJobDaoImpl.java
server/src/com/cloud/storage/snapshot/SnapshotManagerImpl.java