[FTP] implement default location support
[FTP] implement default location support

https://bugzilla.gnome.org/show_bug.cgi?id=560357
https://bugzilla.gnome.org/show_bug.cgi?id=561998

cpatulea/gvfs,cpatulea/gvfs,gicmo/gvfs,xkahn/gvfs-cmis,halfline/gvfs,philipl/gvfs,xkahn/gvfs-cmis,philipl/gvfs,gicmo/gvfs,gicmo/gvfs,xkahn/gvfs-cmis,gicmo/gvfs,halfline/gvfs,xkahn/gvfs-cmis,philipl/gvfs,halfline/gvfs