RestApiClient in stix-shifter using https mount call

[baulus]

No description provided.

[codecov]

Codecov Report

Merging #864 (416b4f6) into develop (483a290) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop     #864   +/-   ##
========================================
  Coverage    63.52%   63.52%           
========================================
  Files          468      468           
  Lines        41671    41671           
========================================
  Hits         26472    26472           
  Misses       15199    15199           

Impacted Files	Coverage Δ
...ter_utils/stix_transmission/utils/RestApiClient.py	52.43% <100.00%> (ø)

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