- add --test option to changelog2spec to make it die on unordered

- add --test option to changelog2spec to make it die on unordered
  dates
- preinstall device-mapper in xen builds
- preinstall mount in xen builds (mandriva & debian)
- create emtpy /etc/default/rcS (debian)
- create empty /etc/fstab to get rid of some error messages
- order packages in host system, not guest system, works around a bug
  in Fedora's rpm package
- add hostname to /etc/hosts
- fix sles10 config
- fix personality switching to use right syscall on i586
- add support for "needsrootforbuild"
- lock root account if building as user abuild
- fix macro expansion to allow simple macros starting with ? or !