unit-test failed on ~ Ubuntu 18.04 zSeries

Host: ubuntu1804-z-3.dallasisv.build.10gen.cc
Project: WiredTiger (develop)
Commit: diff: WT-8718 Return S3 file handle for the open file call, allow reading and close. (#7522)

• Implement structure of GetObject API call
• Modify GetObject to download directly to disk.
• Add a unit test for S3Connection: GetObject().
• Add a struct for the S3FileSystem and implement S3Open
• Implement S3FileRead and S3FileClose using WT Native filehandles
• Allocate S3_STORAGE_SOURCE with new instead of malloc to ensure the std::list constructor is called
• Close all file handles upon storage source terminate.
• Update CTests - improved syntax of TestObjectExists and made TestGetObject self-contained. | 11 Feb 22 02:56 UTC
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