Aborting replication requests if database shutdown was requested.
Stop loading documents from disk if a database shutdown was requested
RavenDB-2665 All prefetching behaviors in the replication task use the same auto tuner. Removing prefetchers of removed or failing for a long time destinations.
Merge pull request #1405 from arekais/replication-task-fixes-2.5

Replication task fixes 2.5