vm/spec: disable pam_systemd globally (#607)
vm/spec: disable pam_systemd globally (#607)

Actually all /etc/pam.d/ files containing pam_systemd.so are autogenerated by
authconfig, so "removing" pam_systemd.so file as not elegant solution, seems to
be much more realiable.

marmarek/qubes-core-admin,woju/qubes-core-admin,QubesOS/qubes-core-admin,woju/qubes-core-admin,woju/qubes-core-admin,QubesOS/qubes-core-admin,marmarek/qubes-core-admin,woju/qubes-core-admin,QubesOS/qubes-core-admin,marmarek/qubes-core-admin