parsebin: forwarding sticky events causes issues with validate
Submitted by Edward Hervey
in the parsebin blocking pad probe handler, we forward sticky events ourselves and returning GST_PAD_PROBE_HANDLED.
The problem is that if there were other non-blocking event probes on that pad or an upstream pad ... it will never be called.
The reason for why is so that when the ghostpad is exposed, it has all sticky events on it.
We need to figure out another way to handle those events at the parsebin level.