unit-test-long failed on ! Ubuntu 18.04

Host: ec2-54-160-111-189.compute-1.amazonaws.com
Project: WiredTiger (develop)
Commit: diff: WT-6474 format RNG not configured until after command-line and CONFIG file processed (#5848)

• Configure the global RNG before doing any command-line or configuration file processing, otherwise
  configurations that require the RNG (for example "runs.rows=1000000:5000000" from the CONFIG.stress
  file), will never be anything other than the default.

Co-authored-by: Tammy Bailey <tammy.bailey@mongodb.com> | 31 Jul 20 02:15 UTC
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