The default scenario is now performing all hotplugs with modes disabled
on all connectors. This is the quickest of the tests and represents
userspace not caring about the new display (e.g. explicitly disabled).

*-hpd-enable-disable-mode covers the most common userspace behavior
where each hotplug event is accompanied by a corresponding enabling /
disabling commit.

*-hpd-with-enabled-mode explicitly targets the scenario where we have
mode enabled and never disable it as we do hotplugs to reproduce the
issue we see with TypeC connectors for ICL and TGL.

v2:
 - refresh igt_display output state after reprobing
 - get mode and set pipe only after we have connector plugged in

v3: fix VGA subtest names (Kunal)

Cc: Kunal Joshi <kunal1.joshi@intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Issue: https://gitlab.freedesktop.org/drm/intel/issues/323


Signed-off-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
Reviewed-by: Kunal Joshi <kunal1.joshi@intel.com>