queue2: Allow re-usability after EOS
queue2: Allow re-usability after EOS

After EOS, it is possible for a pad to be resetted by sending
either a STREAM_START or SEGMENT event

Mimic the same behaviour when receiving STREAM_START/SEGMENT events
in queue2 if we are EOS'd

https://bugzilla.gnome.org/show_bug.cgi?id=786056

StreamUtils/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer