guest-overlay: use squashfs and only pam mount

guest-overlay/files/pam_mount.conf.xml

guest-overlay/files/provision/gast/.bash_logout

guest-overlay/files/provision/gast/.bashrc

guest-overlay/files/provision/gast/.config/Trolltech.conf

guest-overlay/files/provision/gast/.config/enchant/en_US.dic

guest-overlay/files/provision/gast/.config/enchant/en_US.exc

...ay/files/provision/gast/.config/oxygen-gtk/argb-apps.conf

guest-overlay/files/provision/gast/.config/user-dirs.dirs

guest-overlay/files/provision/gast/.config/user-dirs.locale

...erlay/files/provision/gast/.kde/Autostart/schrank.desktop

.../.kde/share/apps/activitymanager/activityranking/database

....kde/share/apps/dolphin/view_properties/global/.directory

....kde/share/apps/dolphin/view_properties/remote/.directory

...properties/search/SVCIa2mLAnEZVVmbuE7mQBEC8Lw=/.directory

...properties/search/csf1oPsh6cb9KCV5jBQlDjwWVMg=/.directory

...properties/search/ggB6TNGNecKbpMzbuWl4wj4thlo=/.directory

...properties/search/px--MEqcJrhfFsGYE9oQ7PJoxdc=/.directory

...overlay/files/provision/gast/.kde/share/apps/kabc/std.vcf

...erlay/files/provision/gast/.kde/share/apps/kabc/std.vcf_7

...t/.kde/share/apps/kded/session/keyboard/layout_memory.xml