kmstest.py: Fix CRTC disabling

The KMSTest.atomic_crtc_disable() method deactivates a CRTC but doesn't
fully disable it, which requires setting the MODE_ID to 0. Furthermore
it doesn't de-associate the CRTC from connectors and planes, which
causes atomic check failures as a fully disabled CRTC can't be
associated with connectors. It can also lead to the next test failing
due to resources still being allocated to the CRTC.

To fix this, introduce an AtomicRequest class that wraps around
pykms.AtomicReq, and stores a copy of all the properties. When the
request is committed the properties are added to a global state, which
is then used to locate and release connectors and planes associated with
the CRTC in KMSTest.atomic_crtc_disable().

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

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