Fix test_hs01 conflict between concurrent operations in cursor modify

unit-test-bucket02 failed on ! Ubuntu 18.04

Host: ec2-100-26-173-108.compute-1.amazonaws.com
Project: WiredTiger (develop)
Commit: diff: WT-7235 Extend API for per-table tiered information. (#6364)

• WT-7235 Extend API for per-table tiered information.

• Add documentation page.

• Typo. End <em> properly.

• Add ex_storage_source.c to examples.dox.

• Add page reference for next doc page.

• Alphabetize example listings in doc.

• Update use of new fields.

• Fix some NULL usage.

• Initialize spin lock. Fix test API usage

• Add local storage to tiered tests

• Whitespace

• Fix initialization of bucket list.

• Fix compilation errors.

• Fixes for reconfigure.

• Initialize start.

• Add default values to tiered table settings.

• Typo

• Clean up bucket storage resources.

• Strdup the auth_token. Only terminate the named storage source.

• Add support for cluster, kmsid and member strings.

• Address review comments. Fix comments, unused flags, duplicate fields,
  etc.

• s_all

• Refactor config parsing. kmsid renamed to auth_token

• Add file system and customize code.

• Add stats and test for varying values.

• Fixes and remove errx calls.

• s_all

• Restore default config values. | 22 Mar 21 15:51 UTC
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