virnetdev: Document reasons for ignoring some SIOCETHTOOL errno values
Recently reverted commit id '6f2a0198' showed a need to add extra comments when dealing with filtering of potential "non-issues". Scanning through upstream patch postings indicates early on the reasons for the filtering of specific ioctl failures were provided; however, when converted from causing an error to VIR_DEBUG's the reasons were missing. A future read/change of the code incorrectly assumed they could or should be removed.
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