Alexandre a91b568149 Support "nf_conntrack", check 90% full, style ...

- Script was checking for "ip_conntrack_..." which was replaced by "nf_conntrack_..." on newer system. Now support both.

-  Return failure ("not ok") when table is more than 90% full.
  - Not sure what value is best here but I think that is better than when the table is full.
    Otherwise we might end up with a value close to the max or bouncing around.

- Replaced cat by "$(< file )" to avoid calling external command
- Follow Google "Shell Style Guide": 2 space indent, use preferred "[[ test ]]", add "readonly"
- Include current connection usage in output message

2019-11-29 13:20:37 +09:00

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