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Instead of using just shell constructs to run hpc-htools correctly
(i.e. HTOOLS=role htools/hpc-htools …), let's add some shell fragments
that do this for us.

This will ease the running of tests directly.
Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: René Nussbaumer <rn@google.com>