Rewrite nft parsing using json

[muhamadazmy]

• Rewrite the full nft parser to use json output of nft
• Add more logs

This is done this way to avoid some inconsistency of the human readable nft output that sometimes causes parsing issues.

This might have cause some port forward deletion to fail because zos can't find the rule handle anymore.

Probably fixes #77

The new parser has been covered by unittests, but we need to test actual nodes that were affected by this bug.

[codecov-io]

Codecov Report

Merging #83 into development will increase coverage by 0.71%. The diff coverage is 60.37%.

@@               Coverage Diff               @@
##           development      #83      +/-   ##
===============================================
+ Coverage        25.34%   26.06%   +0.71%     
===============================================
  Files               54       54              
  Lines             5157     5337     +180     
===============================================
+ Hits              1307     1391      +84     
- Misses            3741     3812      +71     
- Partials           109      134      +25

Impacted Files	Coverage Δ
base/nft/nft.go	33.33% <0%> (-21.51%)	:arrow_down:
apps/core0/subsys/containers/network.go	0% <0%> (ø)	:arrow_up:
apps/core0/helper/socat/socat.go	21.17% <0%> (-0.26%)	:arrow_down:
base/nft/parser.go	69.18% <71.11%> (-12.63%)	:arrow_down:
apps/core0/subsys/containers/flist.go	39.44% <0%> (+6.56%)	:arrow_up:

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