interface-event: Don't dequeue hotplug event in case of interface reload event

interface-event: Don't dequeue hotplug event in case of interface reload event

Dropping hotplug event in case of interface reload results into hotplug scripts
not being being run for the interface and thus external actors not being informed
about the actual state of the interface.

This is clearly visible if the interface auto parameter is set to disabled for
multiple interfaces resulting into no hotplug down event for all interfaces.

Therefore don't flush the interface hotplug queue in case an interface reload
event is observed.

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>