Update testsuite strucuture to latest draft

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@120047 91177308-0d34-0410-b5e6-96231b3b80d8
tree: 3bf1b0a08654c89a1fbf38fa2bcc1b6f5f04e47f
  1. include/
  2. lib/
  3. src/
  4. test/
  5. www/
  6. CREDITS.TXT
  7. LICENSE.TXT
  8. Makefile