unit-test-long failed on ! Ubuntu 18.04

Host: ec2-100-25-36-197.compute-1.amazonaws.com
Project: WiredTiger (develop)
Commit: diff: WT-6331 Set oldest timestamp on startup of WiredTiger (#5912)

• Save the oldest timestamp in the metadata during checkpoint. Retrieve it from the metadata on startup and set it internally
• Adding new python test, test_timestamp19.py
• Adding a function to test format to set the base timestamp on startup | 28 Jul 20 03:33 UTC
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