[Toybox] [PATCH] Implement lsof.

[enh]

Implement lsof.

This is a superset of the current AOSP lsof (which is itself a
superset of the lsof in Android M). It fixes several bugs/misfeatures
and adds support for decoding IPv4/IPv6 tcp/udp/raw sockets and Unix
domain sockets.

I'll remove toolbox lsof as soon as this is available in toybox.

-- 
Elliott Hughes - http://who/enh - http://jessies.org/~enh/
Android native code/tools questions? Mail me/drop by/add me as a reviewer.
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