* add linux_softnet_stat poller
* add graphs and app page for linux_softnet_stat
* fix polling
* rename a few items, clean up the app specific page, and add to the apps page
* convert from derive to counter
* save the budget and budget_usecs to app data
* display current value of the budgets
* now track budget values
* add tests data
* rename it
* add docs for Linux Softnet Stat
* re-order and add budget for app page graph order
* style fix
* correct data location
* fix metrics for the json
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