terminate_pods returns names of deleted pods

[hendrikKahl]

Hi,

this is a copy of PR #89, but as request it has a clean history with rebase instead of merge commits.

This PR would add a return value to the terminate_pods action. I found it quite helpful to get this kind of information persisted in the journal.json document for future reference and further analysis. It would also address #60 .

Since it seems only the return value (or exception) of an action will be stored, I would suggest to store the already available pod names in an array and return it.

Tests have been enhanced to include checks of the return value.

Looking forward to get some thoughts on this suggestion.

Cheers, Hendrik

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@cb77bc1). Click here to learn what that means.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #104   +/-   ##
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  Coverage          ?   81.72%           
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  Files             ?       13           
  Lines             ?      766           
  Branches          ?        0           
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  Hits              ?      626           
  Misses            ?      140           
  Partials          ?        0           

Impacted Files	Coverage Δ
chaosk8s/pod/actions.py	95.91% <100.00%> (ø)

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