Potential fix for URL parsing bugs in BlobClient.from_blob_url()

[chrisyeh96]

This pull request proposes a fix for issue #12563

Consider a blob URL: 'https://lilablobssc.blob.core.windows.net/nacti-unzipped/part0/sub000/2010_Unit150_Ivan097_img0003.jpg'

Before this fix, from_blob_url() would incorrectly parse

• blob_name: '2010_Unit150_Ivan097_img0003.jpg'
• container_name: 'sub000'

This fix correctly parses the url as

• blob_name: 'part0/sub000/2010_Unit150_Ivan097_img0003.jpg'
• container_name: 'nacti-unzipped'

However, I believe my "fix" might be incomplete. In particular, it may not work for Azure Blob Storage accounts hosted on custom endpoints. As I was unable to find adequate documentation on how custom endpoints should be parsed, I did not consider this case. See the existing unit test here: https://github.com/Azure/azure-sdk-for-python/blob/master/sdk/storage/azure-storage-blob/tests/test_blob_client.py#L432-L439

[xiafu-msft]

Hi @chrisyeh96

Thanks so much for this pr! I opened another pr with CI passed, #12619 it should be able to fix your problem.
Would you mind if we close this pr?

[chrisyeh96]

Thanks @xiafu-msft. Looking forward to your fix making it into a release!