* Merge from debian unstable. Remaining changes:
  - debian/patches/9003-fix-path-to-hvmloader-in-testsuite.patch: adjust
    testsuite for 0001-fix-path-to-hvmloader.patch and
    0002-Fix-path-to-pygrub.patch.
  - debian/patches/9004_ubuntu_fix_tree_support.patch: Fix tree detection
    for all ISO/HTTP source, to not longer fail with cobbler/koan.
  - debian/patches/0004-Fix-path-to-qemu-dm.patch: fix the path to the
    qemu-dm binary.
  - debian/{control,rules,pyversions}: Build using dh_python2, use
    debhelper v8 instead of cdbs; for some reason the package build an
    empty binary package when using dh_python2.
  - debian/control: added acl package to depends.
  - debian/control: added libvirt-bin to recommends