format-failure-configs-test failed on ! Ubuntu 18.04

Host: ec2-54-145-154-122.compute-1.amazonaws.com
Project: WiredTiger (develop)
Commit: diff: WT-6710 Change default transaction isolation to snapshot (#6114)

The default session/transaction isolation is changed from
read-committed to snapshot for all the user and internal sessions. The
meta checkpoint internal session still operates under the read-committed
isolation mode. Metadata updates are not checked. | 25 Nov 20 06:31 UTC
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