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test data.  some test cases were adjusted accordingly, too.

so that they will be shared with NSEC3PARAM.

see ticket #1668

of honoring C++ namespaces).

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

"string.h" is requested to define memset().

the original code would still throw an exception (bad_alloc) due to the
resulting huge size of alloc request, but it should be better to catch it
explicitly.