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Because it complains it is not supported on sockets not connected.

But, for some reason, it doesn't really work. The tests fail with
strange error. To be talked about on ML.

To minimize future conflicts, the #1593 (sockcreator cleanup) might have
severe impact on the code.

also constify some variables, and remove unnecessary cast.

Remove the READ/WRITE and DEFAULT macros by replacing them with
functions that thrown an exception on failure.  Other modifications
also made to make the code consistent with this model.

Conflicts:
	src/bin/auth/tests/query_unittest.cc

name confirmed with Likun

sigh.

It should not exist in the real namespace (unless there's something as
well).