[LIBCLOUD-1043] Fix Azure upload_object_via_stream used with iter

[c-w]

Fix Azure upload_object_via_stream used with iter

Description

As described in LIBCLOUD-1043, the Azure Blob Storage driver currently doesn't support use-cases like this:

driver.upload_object_via_stream(iter(something), ...)

This is due to the fact that the current implementation of upload_object_via_stream assumes that the passed-in iterator always implements seek. This pull request adds a fallback for iterators where this is not the case.

Status

• done, ready for review

Checklist (tick everything that applies)

• Code linting
• Documentation Bugfix only
• Tests Added new unit test
• ICLA (required for bigger changes) Code change is small

[c-w]

Tagging @michaelperel since he last modified this code.

[codecov-io]

Codecov Report

Merging #1287 into trunk will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##            trunk    #1287      +/-   ##
==========================================
+ Coverage   85.98%   85.98%   +<.01%     
==========================================
  Files         359      359              
  Lines       73809    73824      +15     
  Branches     6698     6698              
==========================================
+ Hits        63466    63481      +15     
  Misses       7666     7666              
  Partials     2677     2677

Impacted Files	Coverage Δ
libcloud/test/storage/test_azure_blobs.py	92.08% <100%> (+0.15%)	⬆️
libcloud/storage/drivers/azure_blobs.py	68.43% <100%> (+0.47%)	⬆️

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[Kami]

Merged, thanks.