Summary
Update the error handling for the S3 extension classes to return a meaningful error code that can be interpreted by the caller. The S3Connection class, for example, should return errno codes that can be interpreted by the WT_FILE_SYSTEM interface. At present, all S3 class methods return 1 for failure. 

Motivation

• Does this affect any team outside of WT? Not at present.
• How likely is it that this use case or problem will occur? 100%.
• If the problem does occur, what are the consequences and how severe are they? Not severe at present as there are no consumers of the extension outside our internal testing.
• Is this issue urgent? No.

Acceptance Criteria (Definition of Done)

• S3 class methods are updated to return meaningful error codes. S3 code comments are updated accordingly.