Revamp AWS file support to add support for multipart uploads in glacier testing

[netsettler]

• In new module bucket_utils.py:

  • parse_s3_object_name

• In common.py:

  • New glacier-related constants:

  • STANDARD

  • REDUCED_REDUNDANCY

  • STANDARD_IA

  • ONEZONE_IA

  • INTELLIGENT_TIERING

  • GLACIER

  • DEEP_ARCHIVE

  • OUTPOSTS

  • GLACIER_IR

  • New type hint S3ObjectNameSpec

• In glacier_utils.py:

  • Allow a version_id= argument to GlacierUtils.is_restore_finished

  • Some improved error messages.

  • Some small code refactors.

• In misc_utils.py:

  • Make make_counter threadsafe so that threaded functionality can call it.

• In qa_utils.py:

  • Support for mock glacier testing in MockBotoS3Client for methods:

  • create_multipart_upload

  • upload_part_copy

  • complete_multipart_upload

  • Revamp the abstractions for managing MockFileSystem to allow for centralized changes that might be needed to handle new file content types, such as

  • MockAbstractContent

    • MockBigContent for mocking large files quickly and space-efficiently.

    • MockPartableBytes for mocking small content that still wants to test piecewise-copying in support of the multipart upload protocol.