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Extend the simply functionality by repeating it under the rude
interrupter and chain together a couple of steps in new test cases.

As a compromise for adding more tests, incorporate the piglit subtest
framework.

Depends on libdrm 057fab3382c02af54126ce395c43d4e6dce9439a

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=31123Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

A few of the tools can be performed post-mortem from a different system,
so it is useful to be able to compile those tools on those foreign
systems. Obviously, any program to interact with the PCI device or talk
to GEM will fail on a non-Intel system.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

This caught a bug with get_user_pages usage in the kernel, which would
result in zeroes being read out of the object when faulting in a new page.