guest-overlay: use squashfs and only pam mount

guest-overlay/files/provision/gast/.kde/share/config/knoderc

...t-overlay/files/provision/gast/.kde/share/config/knotesrc

...rlay/files/provision/gast/.kde/share/config/kolourpaintrc

...-overlay/files/provision/gast/.kde/share/config/konsolerc

...t-overlay/files/provision/gast/.kde/share/config/kopeterc

...t-overlay/files/provision/gast/.kde/share/config/korgacrc

...s/provision/gast/.kde/share/config/korganizer_printing.rc

...erlay/files/provision/gast/.kde/share/config/korganizerrc

guest-overlay/files/provision/gast/.kde/share/config/kpat

guest-overlay/files/provision/gast/.kde/share/config/kpgprc

...ay/files/provision/gast/.kde/share/config/kres-migratorrc

...provision/gast/.kde/share/config/kresources/contact/stdrc

...-overlay/files/provision/gast/.kde/share/config/krunnerrc

guest-overlay/files/provision/gast/.kde/share/config/ksamerc

...lay/files/provision/gast/.kde/share/config/kservicemenurc

...erlay/files/provision/gast/.kde/share/config/ktimezonedrc

...y/files/provision/gast/.kde/share/config/kuriikwsfilterrc

...-overlay/files/provision/gast/.kde/share/config/kwalletrc

guest-overlay/files/provision/gast/.kde/share/config/kwinrc

...verlay/files/provision/gast/.kde/share/config/kwinrulesrc