Adapted registry interface to newest API version

[johannesduesing]

Reason for this PR
This PR changes the Delphi registry HTTP interface in order to be more REST-like (as discussed here). The status report endpoints that each of the Delphi components calls have to be adapted to the new API specification.

Changes in this PR

• Adapted URLs that are being called to the new API schema

Related PRs
The same has been done for the

• WebApi
• WebApp

[bhermann]

Looks good to me

[codecov-io]

Codecov Report

Merging #36 into develop will decrease coverage by 0.02%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           develop     #36      +/-   ##
==========================================
- Coverage     8.06%   8.04%   -0.03%     
==========================================
  Files           45      45              
  Lines         1178    1181       +3     
  Branches        33      34       +1     
==========================================
  Hits            95      95              
- Misses        1083    1086       +3

Impacted Files	Coverage Δ
.../crawler/instancemanagement/InstanceRegistry.scala	0% <0%> (ø)	⬆️

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