Implementation of Satellite adapter

[lsowa]

This is a draft

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.03%. Comparing base (b654fbc) to head (5f80498).
⚠️ Report is 5 commits behind head on master.

Additional details and impacted files

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##           master     #383   +/-   ##
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  Coverage   99.03%   99.03%           
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  Files          55       55           
  Lines        2288     2288           
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  Hits         2266     2266           
  Misses         22       22           

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[lsowa]

Rough overview:

• SatelliteAdapter implemented
  • using a Satellite API wrapper SatelliteClient
  • introducing resource tag tardis_reserved as parameter in satellite
  • working with asynchron coroutines
• tests implemented
• documentation added
• add caching for status updates
  • introduced 'forced' cache updates -> update cache after changing power status/tardis_reserved to ensure stability
• tested on a setup with multiple (physical) machines