[master] don't initialize test data objects in namescope level.
this caused statici initialization fiasco for some build, e.g.: http://git.bind10.isc.org/~tester/builder/BIND10/20130508225127-MacOSX10.6-x86_64-Clang-Static/logs/unittests.out string objects moved inside the compare tests did not actually cause harm in this environment, but should be generally better to be initialized this way for the same reason. while it's not a kind of 5-line patch, it should be pretty straightforward, so I'm committing it at my discretion.
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