Improved handling of imports from utils.py

[AleksMat]

This is a short-term improvement for #296

[codecov-commenter]

Codecov Report

Merging #308 (a13775d) into develop (9ef079a) will increase coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #308      +/-   ##
===========================================
+ Coverage    89.37%   89.39%   +0.02%     
===========================================
  Files           49       49              
  Lines         4481     4481              
===========================================
+ Hits          4005     4006       +1     
+ Misses         476      475       -1     

Impacted Files	Coverage Δ
sentinelhub/data_collections.py	96.38% <0.00%> (-0.46%)	⬇️
sentinelhub/os_utils.py	78.78% <0.00%> (+6.06%)	⬆️

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