Siri 2.7 - fixes for using the new 2.7 MOT server

[evyatark]

Siri 2.7 - fixes for using the new 2.7 MOT server

• url moved to configuration so it can be changed easily
• some changes in XML of request, because former request is not accepted by the new 2.7 MOT server
• some changes in stripping the soap envelope from the response, because it failed with the XML of responses from the new 2.7 MOT server

[codecov-commenter]

Codecov Report

Merging #323 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #323   +/-   ##
=======================================
  Coverage   93.96%   93.96%           
=======================================
  Files           3        3           
  Lines         116      116           
=======================================
  Hits          109      109           
  Misses          7        7           

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