Release Storage Track 2 Library Preview 4 for Python

[kurtzeborn]

*=Work owned by xstore team

Features

• * Batch [Python Track2] [STG69] Batch Set tier [must have] #6436
  • Azure.Core support for content type multi-part/mixed Support multi-part/mixed content type in Azure.Core #6995
• * Echo client request ID [Python Track2] [STG69] EchoClientRequestId #6437
• * DownloadSparsePageBlob [Python Track2] download of page blobs should take advantage of their sparseness #7295

Breaking Changes

• Consistency in offset and length [Storage] Make offset and length consistent across APIs #7509
• Permission models [Storage] ***Permissions models should be renamed to ***SasPermissions #7508 Remove enum-like list parameters from permssions models  #7510
• from_blob_url method [Storage Blob] Add a from_blob_url method #7511
• max_connections Storage - Rename max_connections to max_concurrency #7512
• Modify **kwargs Modify method signatures to use more **kwargs #7503

Fit and finish

• Other API review changes [Storage] Non breaking Changes fromAPI preview #7507
• Tests Perf Tests for storage #7263
• Use swagger generated version as constant API version [azure-storage] Use generated version as constant API version #6193
• Regenerate Swagger Regenerate swagger and revert the workaround for xml #7264
• Unicode chars [storage] Queue messages with unicode chars on Py2.7 fail #6685
• userDelegationToken bug unable to obtain userdelegationkey #6977
• Urllib3 Bug [Storage Blob] Request breaks when blob_name has a '~' character.  #7407
• * download blob with offset bug Strange results for download_blob with offset and length #7061

Moved to Preview 5 / At risk

• CI improvements [azure-storage] Add devops step for validating shared code #6167
• Storage Stream Downloader Storage Stream Downloader #7504
• Retriable data streamer [Storage] Implement retriable data streamer #5121
• response hook param [Storage] Adopt a response hook param for headers #7067
• Docs [azure-storage] Document all optional kwargs for configuration #6165
• Tests [azure-storage] Refactor Blobs and Files test suite to use latest devtools #6225, [Storage] Implement advanced scenario tests #5120

[kurtzeborn]

Preview 4 has shipped. All remaining, open issues moved to preview 5.