Description of problem:
Can't install libguestfs on rawhide

[root@otto ~]# yum install libguestfs
Last metadata expiration check: 0:46:31 ago on Wed 19 Jul 2017 12:50:15 PM EDT.
Error: 
 Problem: problem with installed package perl-interpreter-4:5.26.0-395.fc27.x86_64
  - package perl-interpreter-4:5.26.0-395.fc27.x86_64 requires libperl.so.5.26()(64bit), but none of the providers can be installed
  - cannot install both perl-libs-4:5.24.1-390.fc26.x86_64 and perl-libs-4:5.26.0-395.fc27.x86_64
  - package perl-Sys-Virt-3.2.0-1.fc26.x86_64 requires libperl.so.5.24()(64bit), but none of the providers can be installed
  - problem with installed package perl-Sys-Virt-3.5.0-1.fc27.x86_64
  - package perl-Sys-Virt-3.5.0-1.fc27.x86_64 requires libvirt.so.0(LIBVIRT_3.4.0)(64bit), but none of the providers can be installed
  - package libvirt-libs-3.5.0-2.fc27.x86_64 requires libxenlight.so.4.9()(64bit), but none of the providers can be installed
  - cannot install both xen-libs-4.8.1-2.fc26.x86_64 and xen-libs-4.9.0-1.fc27.x86_64
  - package libvirt-daemon-kvm-3.2.1-3.fc26.x86_64 requires libvirt-daemon = 3.2.1-3.fc26, but none of the providers can be installed
  - package libguestfs-1:1.37.17-2.fc27.x86_64 requires libvirt-daemon-kvm >= 0.10.2-3, but none of the providers can be installed
  - package libvirt-daemon-3.2.1-3.fc26.x86_64 requires libxenlight.so.4.8()(64bit), but none of the providers can be installed
  - package libvirt-daemon-kvm-3.5.0-2.fc27.x86_64 requires qemu-kvm, but none of the providers can be installed
  - package qemu-kvm-2:2.9.0-1.fc27.x86_64 requires qemu-system-x86 = 2:2.9.0-1.fc27, but none of the providers can be installed
  - package qemu-kvm-2:2.9.0-1.fc26.1.x86_64 requires qemu-system-x86 = 2:2.9.0-1.fc26.1, but none of the providers can be installed
  - package qemu-system-x86-2:2.9.0-1.fc27.x86_64 requires qemu-system-x86-core = 2:2.9.0-1.fc27, but none of the providers can be installed
  - package qemu-system-x86-2:2.9.0-1.fc26.1.x86_64 requires qemu-system-x86-core = 2:2.9.0-1.fc26.1, but none of the providers can be installed
  - package qemu-system-x86-core-2:2.9.0-1.fc27.x86_64 requires libxenctrl.so.4.8()(64bit), but none of the providers can be installed
  - package qemu-system-x86-core-2:2.9.0-1.fc26.1.x86_64 requires libxenctrl.so.4.8()(64bit), but none of the providers can be installed
  - cannot install the best candidate for the job
(try to add '--allowerasing' to command line to replace conflicting packages or '--skip-broken' to skip uninstalable packages)

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