check_nwstat: adds percentage used space (#1183)

[waja]

he @skottler, you may have seen that I just pulled the patches committed
over there on SF into PRs, mostly they may not changed/reworked yet.
As we can't contact the authors of those directly, as the old project on SF
is locked, I guess we need to polish them for our own, if we want to catch
them.

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