Fix the wrong assert of disk image write gen comparison with btree base write gen

recovery-stress-test-1 failed on Ubuntu 18.04 Stress tests

Host: ec2-3-239-111-35.compute-1.amazonaws.com
Project: WiredTiger (develop)
Commit: diff: WT-7428 Move bstorage usage out of btree and into tiered structure. (#6501)

• WT-7428 Move bstorage usage out of btree and into tiered structure.

• Fix when we call config_bstorage.

• Refactor configuration routines.

• Review comments. Unused variables, RET use after ERR.

• Remove unused function

• Properly initialize bucket variable.

• Run s_all | 04 May 21 01:58 UTC
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