Fixed design flaw for get_blob_to_* and get_file_to_* methods when max_connections is 1

[zezha-msft]

No description provided.

[codecov-io]

Codecov Report

Merging #473 into dev will increase coverage by 0.89%.
The diff coverage is 69.1%.

@@            Coverage Diff             @@
##              dev     #473      +/-   ##
==========================================
+ Coverage   86.15%   87.05%   +0.89%     
==========================================
  Files          57       57              
  Lines        4565     4604      +39     
  Branches      495      500       +5     
==========================================
+ Hits         3933     4008      +75     
+ Misses        476      436      -40     
- Partials      156      160       +4

Impacted Files	Coverage Δ
...zure-storage-common/azure/storage/common/_error.py	89% <ø> (-0.11%)	⬇️
...rage-file/azure/storage/file/_download_chunking.py	73.61% <51.35%> (+55.42%)	⬆️
...rage-blob/azure/storage/blob/_download_chunking.py	85.89% <72.22%> (+25.24%)	⬆️
...ure-storage-file/azure/storage/file/fileservice.py	92.79% <76.92%> (+0.77%)	⬆️
...storage-blob/azure/storage/blob/baseblobservice.py	94.06% <83.33%> (-0.8%)	⬇️
...ure-storage-blob/azure/storage/blob/_encryption.py	90.24% <0%> (-3.66%)	⬇️

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