[PATCH] libresolv tests

[Florian Weimer]

The attached patch depends on the support/ enhancements I posted 
earlier.  It contains some of the short-running tests from my 
out-of-tree resolver test suite.

The included changes to support/ are fairly substantial, but I expect 
that other tests will use these facilities over time.

I plan to contribute more such libresolv tests, but some of them have to 
be xtests because they have many timeouts and really long run times.

Further work (RES_USE_INET6 deprecation and various libresolv cleanups 
and fixes) is blocked on the availability of the libresolv test 
framework within the glibc source tree.

Thanks,
Florian
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