Incremental backup not supported in backward compatibility mode

compatibility-test-for-newer-releases failed on Compatibility tests

Host: ec2-18-234-93-61.compute-1.amazonaws.com
Project: WiredTiger (develop)
Commit: diff: WT-6610 It is not an error if the backup rename configuration is not … (#5966)

• WT-6610 It is not an error if the backup rename configuration is not found.

• Retain the value of ret.

• Add test covering upgrade with backup and rename

• Add back in the changes from WT-6215 and WT-6539

• Reinstate testing logic lost in merge/reapply

• Fixes if 'rename' is not in the configuration string.
  Allow format compatibility to test incremental backup.

Co-authored-by: Alexander Gorrod <alexander.gorrod@mongodb.com> | 27 Aug 20 13:42 UTC
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