format-stress-test-3 failed on Ubuntu 18.04 Stress tests

Host: ec2-54-210-185-119.compute-1.amazonaws.com
Project: WiredTiger (feature branch)
Commit: diff: WT-6427 Always set stable timestamp when setting oldest timestamp (#5816)

• WT-6427 Always set stable timestamp when setting oldest timestamp.
  Set stable ts to the "all_durable" value, and let oldest ts lag that.

• Fixed arg for set_timestamp.
  Changed trace status line to always show stable timestamp.

• Rework the timestamp code to do a final bump of the oldest, stable and current timestamp as part
  of shutting down. This lets us do normal RTS testing and then we always bump the timestamps.

Add a #define for the block allocation, I'm tired of trying to remember why it's 512.

• WT-6423 Salvage testing fails after setting stable timestamp in test format #5822

Co-authored-by: Don Anderson <dda@mongodb.com>
Co-authored-by: Keith Bostic <keith.bostic@mongodb.com> | 19 Jun 20 16:15 UTC
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