Refactor java_net_NetworkInterface.cpp for clarity.

All I wanted to do was remove the SOCKERR_ mess, but things got out of hand.
There's still plenty of stuff that could be cleaned up, but nothing that can't
wait. I'm only doing this to make things easier for the IPv6 changes.

This patch:
* removes the SOCKERR_ mess which was causing vague "Operation failed"
IOExceptions; we now use the actual errno value of whatever caused the failure.
* simplifies memory management so we don't have to do lots of cleanup on
every exit from each function.
* simplified fd management for the same reason.
* reduces the use of the intermediate structure, going straight to Java objects
in places. (This is the unfinished work: we should get rid of the intermediate
representation. It's not useful.)
* replaces structInToJavaAddress and structInToInetAddress with a call to the
better socketAddressToInetAddress from OSNetworkSystem.cpp.
* uses more intention-revealing variable and function names.
* removes attempts to throw exceptions when perfectly good exceptions have
already been thrown.
* removes filtering of interfaces that aren't up. The RI doesn't do this
filtering, there's no reason to do it, and it's always going to be a race
condition anyway.
* removes untrue comments.
* removes a lot of inexplicably empty lines.

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