* Disabled backup operation scheduling, not needed since backup replicas are synced by partition updates.
* Fixed backup replica version calculation during backup op send.
* Fixed backup replica index calculation.
* Limited parallel replica sync operations.
* Removed problematic test marker from BackupTests.
checkstyle fixes
Merged with latest master bracnh
Merge pull request #1994 from mdogan/fix/3.2/partition

PartitionService backup/replication fixes...