[v3] testsuite consistency checks

[Benjamin Kosnik <bkoz at redhat dot com>]

This fixes up the rest of the inconsistencies found when typing "make 
testsuite_files" and looking through the list of files in the libstdc++ 
testsuite.

Changes:
1) correct comment as pointed by Paolo
2) consistent file naming of explicit_instantiation.cc
3) move dr438 checks into class-being-tested requirements directory, as 
done with basic_string.

Sorry for the churn. We're starting to do pretty big transformations 
while testing and it helps if there is only one way to do things.

tested x86/linux

-benjamin

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