Fix memory leak in session_rename

make-check-asan-test failed on RHEL 8.0

Host: ec2-34-203-29-188.compute-1.amazonaws.com
Project: WiredTiger (develop)
Commit: diff: WT-6215 Clear backup block information on rename. (#5662)

• WT-6215 Clear backup block information on rename.

• Set all bits in backup info of new metadata on rename.

• We need to retain all the incremental metadata information on rename.

• Add a rename field to incremental backup info in metadata for rename
  management.

Co-authored-by: Alex Cameron <alex.cameron@10gen.com> | 22 Jul 20 13:46 UTC
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