fix and clean up debhelper files

Maximilian Engelhardtrequested to merge
myx/debian-xen:myx/fix_debhelper_files into master
  • fix installing of xen-hypervisor-V-F.postrm by renaming it to the correct filename
  • fix installing of xen-hypervisor-V-F.bug-control by renaming it to the correct filename
  • remove unused debhelper files

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