tests/kms_flip: Retry test in case of a DP/HDMI link reset

At least an IIyama and LG monitor have a strange behaviour when waking
from a power saving state and getting enabled with an otherwise
successful modeset: after the modeset in ~2 sec they signal a bad link
state, either due to a lost CR/EQ in case of DP or a lost
scrambling/TMDS clock setting in case of HDMI link. In response the
driver resets the link with either a link-retraining or a modeset, which
in turn makes the test miss vblank/flip events and fail.

Work around the above issue, by retrying the test once if the test
detects after a failure that a link reset happened during the test and a
corresponding hotplug uevent was sent by the driver.

v2: Suspend the signal helper while waiting for a hotplug event, so the
    wait will not get inerrupted/restarted in an endless loop.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>

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