Add GUPnPWhiteList to the library

https://bugzilla.gnome.org/show_bug.cgi?id=705712
Use GUPnPWhiteList in GUPnPContextManager

GUPnPContextManager is now using GUPnPWhiteList to filter networks

Add test program

https://bugzilla.gnome.org/show_bug.cgi?id=705712