tests/chamelium: Check all connectors state for basic hotplug

Without doing a full reprobe, hpd toggles are sent without much delay
between them. With a VGA connector attached, the reset occurring before
the test will toggle its state, with a delay (inherent to hpd detection
on VGA).

It often occurs that this VGA state toggle is detected in the middle of
the current connector test, triggering a hotplug event unrelated to the
current connector and thus causing the test to fail.

Thus, the state of all connectors is checked (and waited for) before
running the basic hotplug test.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@linux.intel.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>

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