Commit e199192caefef068b5bf57da8b878e0bc82e3453 introduced the ability
to have multiple SSYNC running on a single device. It misses a security
to ensure that only one SSYNC request can be running on a partition.
This commit update replication_lock to lock N times the device, then
lock once the partition related to a SSYNC request.
Change-Id: Id053ed7dd355d414d7920dda79a968a1c6677c14
014d46f9a7