queue2: Forward the schedule query upstream
queue2: Forward the schedule query upstream

When asked about the scheduling flags first check with upstream and
simply add the _SEEKABLE flag when using a temporary file as storage.

This enables the forwarding of _SEQUENTIAL and _BANDWIDTH_LIMITED from
sources if needed.

https://bugzilla.gnome.org/show_bug.cgi?id=704927

cfoch/gstreamer,ensonic/gstreamer,krieger-od/gstreamer,surround-io/gstreamer,mparis/gstreamer,lubosz/gstreamer,collects/gstreamer,lovebug356/gstreamer,krieger-od/gstreamer,krieger-od/gstreamer,surround-io/gstreamer,Lachann/gstreamer,jpxiong/gstreamer,cablelabs/gstreamer,justinjoy/gstreamer,surround-io/gstreamer,krichter722/gstreamer,jpakkane/gstreamer,ensonic/gstreamer,krichter722/gstreamer,lovebug356/gstreamer,StreamUtils/gstreamer,Lachann/gstreamer,krichter722/gstreamer,jpakkane/gstreamer,collects/gstreamer,Lachann/gstreamer,cfoch/gstreamer,jpxiong/gstreamer,lubosz/gstreamer,surround-io/gstreamer,Lachann/gstreamer,jpakkane/gstreamer,ensonic/gstreamer,jpakkane/gstreamer,lubosz/gstreamer,lovebug356/gstreamer,jpakkane/gstreamer,mparis/gstreamer,StreamUtils/gstreamer,cablelabs/gstreamer,jpxiong/gstreamer,mparis/gstreamer,krichter722/gstreamer,lovebug356/gstreamer,centricular/gstreamer,surround-io/gstreamer,cfoch/gstreamer,jpxiong/gstreamer,krichter722/gstreamer,shelsonjava/gstreamer,shelsonjava/gstreamer,ensonic/gstreamer,lovebug356/gstreamer,jpxiong/gstreamer,collects/gstreamer,krieger-od/gstreamer,cfoch/gstreamer,justinjoy/gstreamer,cablelabs/gstreamer,lubosz/gstreamer,collects/gstreamer,justinjoy/gstreamer,centricular/gstreamer,Lachann/gstreamer,centricular/gstreamer,shelsonjava/gstreamer,lubosz/gstreamer,collects/gstreamer,shelsonjava/gstreamer,cablelabs/gstreamer,justinjoy/gstreamer,centricular/gstreamer,cablelabs/gstreamer,ensonic/gstreamer,StreamUtils/gstreamer,shelsonjava/gstreamer,cfoch/gstreamer,krieger-od/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer,justinjoy/gstreamer,mparis/gstreamer,centricular/gstreamer,mparis/gstreamer