NRI network

[pfl]

Implementation of NRI network messages. The messages added are:

• NetworkConfigurationChanged when the CNI config has been read from disk
• PreSetupNetwork before CNI is set up
• PostSetupNetwork after successful CNI configuration
• Pre- and PostNetworkDeleted once the pod network is removed

[pfl]

Fixed forgotten test cases and NetworkDeleted functionality

[codecov-commenter]

Codecov Report

Attention: 195 lines in your changes are missing coverage. Please review.

Comparison is base (c68cf49) 64.61% compared to head (40fbd54) 58.27%.

:exclamation: Current head 40fbd54 differs from pull request most recent head ce1e5a1. Consider uploading reports for the commit ce1e5a1 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #57      +/-   ##
==========================================
- Coverage   64.61%   58.27%   -6.34%     
==========================================
  Files           9        9              
  Lines        1834     2030     +196     
==========================================
- Hits         1185     1183       -2     
- Misses        498      696     +198     
  Partials      151      151              

Files	Coverage Δ
pkg/adaptation/adaptation.go	61.14% <0.00%> (-11.55%)	:arrow_down:
pkg/adaptation/plugin.go	40.58% <0.00%> (-8.01%)	:arrow_down:
pkg/adaptation/result.go	71.02% <1.07%> (-8.82%)	:arrow_down:

... and 1 file with indirect coverage changes

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[pfl]

Plugin fixed to match expected functions

[pfl]

Removed 'WIP' labels as this PR has progressed into something decently useful.

[aojea]

/cc

[pfl]

Let's revisit this PR once KNI has taken shape. At that point we will learn whether any CNI specific plugins will be needed or if plugins interested in network activity listen to KNI instead.

[MikeZappa87]

@pfl want to reopen this?

[pfl]

Once KNI messaging gets specified, NRI plugins may perhaps hook into KNI directly. If needed, a non-KNI NRI based setup should be as close to a KNI one as possible in order to avoid excessive coding and added architecture. Right now I'm unfortunately (de)allocated to some DRA work until mid Q3. Thus the pause in this PR.