[FLINK-4196] [runtime] Remove recovery timestamp from checkpoint restores #2243
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The 'recoveryTimestamp' was an unsafe wall clock timestamp attached by the master upon recovery. Because this timestamp cannot be relied upon in distributed setups, it is removed here.
If we need something like this in the future, we should try and get a globally progress counter or logical timestamp instead.
No code in the core Flink repository is affected by this change.