guest-overlay: use squashfs and only pam mount

...on/gast/.kde/share/apps/kfileplaces/bookmarks.xml.tbcache

...files/provision/gast/.kde/share/apps/klipper/history2.lst

...y/files/provision/gast/.kde/share/apps/korganizer/std.ics

.../files/provision/gast/.kde/share/apps/korganizer/std.ics~

...rovision/gast/.kde/share/apps/kres-migrator/migration.log

.../.kde/share/apps/kscreen/5e744f73f3e7fd293666a0d94cffcc7a

.../.kde/share/apps/kscreen/f4bdefb9cddee55cbd54bd1d182cf2a8

...rovision/gast/.kde/share/autostart/plasma-netbook.desktop

...rovision/gast/.kde/share/config/activitymanager-pluginsrc

.../files/provision/gast/.kde/share/config/activitymanagerrc

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

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

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

...les/provision/gast/.kde/share/config/calendar_printing.rc

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

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

...iles/provision/gast/.kde/share/config/foldermailarchiverc

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

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

...-overlay/files/provision/gast/.kde/share/config/gtkrc-2.0