[REF] Rename server into node

[YannickB]

159

[codecov-io]

Current coverage is 31.16% (diff: 17.46%)

Merging #171 into master will increase coverage by <.01%

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  Lines          5609       5608     -1   
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
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  Hits           1748       1748          
+ Misses         3861       3860     -1   
  Partials          0          0          

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[YannickB]

Yeah this one was a little more trickier, server was especially used in many sources and Dockerfiles. I made the search and replace only on the .xml and .py so I think I avoided most of the wrong replace, and I reviewed each change manually.

[YannickB]

It shall be noted that I made a oneclick installation with the new service and node terms, so no need to worry too much we shall just have maybe some random errors here and there in the next weeks.