renderer: Set "Connection" header to close
renderer: Set "Connection" header to close

Fixes DLNA test case 7.4.20.4

Original author: Xia Zhou <3f9a1adf9bd1136571c845c08e0ef2b3f3e7ddfe@gmail.com>
Signed-off-by: Xia Zhou <3f9a1adf9bd1136571c845c08e0ef2b3f3e7ddfe@gmail.com>

Tarnyko/rygel,GNOME/rygel,GNOME/rygel,GNOME/rygel,Tarnyko/rygel