gvfs-test: Split "myfiles" share into public and private
gvfs-test: Split "myfiles" share into public and private

This behaves better under smbd running as user under different Samba versions
and avoids artifacts like 0700 files being accessible as guest user, as smbd
running as the user cannot change uid.

https://bugzilla.gnome.org/show_bug.cgi?id=686006

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