For the purpose of testing things such as hotplugging and bad monitors,
the ChromeOS team ended up designing a neat little device known as the
Chamelium. More information on this can be found here:

	https://www.chromium.org/chromium-os/testing/chamelium



This adds support for a couple of things to intel-gpu-tools:
 - igt library functions for connecting to udev and monitoring it for
   hotplug events, loosely based off of the unfinished hotplugging
   implementation in testdisplay
 - Library functions for controlling the chamelium in tests using
   xmlrpc. A couple of RPC calls were ommitted here, mainly because they
   didn't seem very useful for our needs (yet)
 - A set of functions for doing CRC checks and frame comparisons in
   tests
 - A set of basic tests using the Chamelium library.

Cc: Tomeu Vizoso <tomeu@tomeuvizoso.net>
Signed-off-by: Lyude <lyude@redhat.com>

Changes since v1:
- Don't try to guess connector mappings, have the user specify th...