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Make file lock packet type explicit

`FileLockCommunicator` now includes an additional byte that represents

the `FileLockPacketType` when sending packets to other processes.

`DefaultFileLockContentionHandler` now checks for the

`LOCK_RELEASE_CONFIRMATION` type instead of interpreting any packet for

a lock for which it already has received a packet as a lock release


Adding the additional byte will be ignored by old versions which only

read the first 9 bytes. New versions can still read packets from old

versions that do not include the byte. They use the `UNKNOWN` type in

this case. Thus, this protocol change is backwards compatible.

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