server/red_worker: introduce red_channel_pipe_clear
server/red_worker: introduce red_channel_pipe_clear

No more common_release_pipe_item

Fantu/spice,ya-mouse/spice,fgouget/spice,freedesktop-unofficial-mirror/spice__spice,mathslinux/spice,Fantu/spice,fgouget/spice,dezelin/spice,alon/spice-server,elmarco/spice,freedesktop-unofficial-mirror/spice__spice,dezelin/spice,mathslinux/spice,ya-mouse/spice,freedesktop-unofficial-mirror/spice__spice,alon/spice-server,elmarco/spice,alon/spice-server,mathslinux/spice,mathslinux/spice,SPICE/spice,Fantu/spice,elmarco/spice,dezelin/spice,dezelin/spice,alon/spice-server,SPICE/spice,elmarco/spice,SPICE/spice,dezelin/spice,ya-mouse/spice,freedesktop-unofficial-mirror/spice__spice,fgouget/spice,alon/spice-server,elmarco/spice,Fantu/spice,mathslinux/spice,freedesktop-unofficial-mirror/spice__spice,fgouget/spice