netclock: Add round-trip-limit parameter
netclock: Add round-trip-limit parameter

Sometimes, packets might take a very long time to return. Such packets
usually are way too late and destabilize the regression with their
obsolete data. On Wi-Fi, round-trips of over 7 seconds have been observed.

If the limit is set to a nonzero value, packets with a round-trip period
larger than the limit are ignored.

Signed-off-by: Carlos Rafael Giani <dv@pseudoterminal.org>

https://bugzilla.gnome.org/show_bug.cgi?id=712385

cfoch/gstreamer,Lachann/gstreamer,Lachann/gstreamer,jpxiong/gstreamer,ensonic/gstreamer,StreamUtils/gstreamer,cfoch/gstreamer,ensonic/gstreamer,surround-io/gstreamer,shelsonjava/gstreamer,mparis/gstreamer,centricular/gstreamer,StreamUtils/gstreamer,surround-io/gstreamer,shelsonjava/gstreamer,jpakkane/gstreamer,centricular/gstreamer,cfoch/gstreamer,jpakkane/gstreamer,surround-io/gstreamer,centricular/gstreamer,cfoch/gstreamer,ensonic/gstreamer,StreamUtils/gstreamer,mparis/gstreamer,ensonic/gstreamer,surround-io/gstreamer,mparis/gstreamer,jpxiong/gstreamer,krichter722/gstreamer,krichter722/gstreamer,krichter722/gstreamer,jpakkane/gstreamer,ensonic/gstreamer,cfoch/gstreamer,jpakkane/gstreamer,surround-io/gstreamer,Lachann/gstreamer,jpxiong/gstreamer,krichter722/gstreamer,centricular/gstreamer,jpakkane/gstreamer,cablelabs/gstreamer,StreamUtils/gstreamer,cablelabs/gstreamer,cablelabs/gstreamer,Lachann/gstreamer,shelsonjava/gstreamer,cablelabs/gstreamer,shelsonjava/gstreamer,jpxiong/gstreamer,Lachann/gstreamer,mparis/gstreamer,StreamUtils/gstreamer,centricular/gstreamer,mparis/gstreamer,jpxiong/gstreamer,shelsonjava/gstreamer,krichter722/gstreamer,cablelabs/gstreamer