format-stress-sanitizer-smoke-test failed on Ubuntu 18.04

Host: ec2-52-91-152-238.compute-1.amazonaws.com
Project: WiredTiger (develop)
Commit: diff: WT-5628 Don't perform rollback to stable on files that don't exist (#5294)

As part of rollback to stable, ignore performing rollback to stable
on files that don't exist and also avoid performing the checkpoint
and history store search when in in_memory configuration mode | 24 Feb 20 03:27 UTC
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