Hotfix/parsing error

[janniclas]

This pull request addresses all errors left open in #89 .
The main points that were fix are

• fixed reference error not finding viewchild table in table all component. (Render Rows sometimes fails #97)
• added hot reloading functionality for state change events.
• fixed http parse error in frontend (Json parse error when calling stopInstance #92)

@johannesduesing & @ishwaryaPaderborn , since you two investigated the last pull request and reported the open errors I would like to ask you two again to verify if this pull requests successfully resolves them.

[codecov-io]

Codecov Report

Merging #95 into develop will increase coverage by 0.04%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           develop     #95      +/-   ##
==========================================
+ Coverage     4.65%   4.69%   +0.04%     
==========================================
  Files           11      11              
  Lines          215     213       -2     
  Branches         9      15       +6     
==========================================
  Hits            10      10              
+ Misses         205     203       -2

Impacted Files	Coverage Δ
app/controllers/InstanceRegistryController.scala	0% <0%> (ø)	⬆️

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[johannesduesing]

Working just fine. I found that deleting a paused instance is possible from the frontend (@ishwaryaPaderborn is this desired behavior?), but docker actually issues an error that paused instances cannot be deleted. I will change the registry accordingly, so only stopped instances can be deleted 👍

[ishwaryamamidi]

@janniclas Below are the few issues I found :

1. When an Instance is 'Running' and try to 'Resume' it throws a 400 error.
2. When an Instance is 'Paused' and try to 'Resume' it the state changes to 'Running'. I think in this case the state should be updated to 'Resumed'.

@johannesduesing I remember discussing this case with the backend team, it was told that only a 'Stopped' instance cannot be deleted and in all other cases it can be deleted. But we can make the changes in the frontend to restrict deleteing even when an instance is 'Paused'.