conf: Use correct attribute name in error message
conf: Use correct attribute name in error message

The <capabilities> feature has an attribute named 'policy', but the
error message mentioned the non-existing 'state' attribute instead.

Signed-off-by: Andrea Bolognani <3ada0bee826c753786fdbba72243dfba997094cf@redhat.com>

jardasgit/libvirt,jfehlig/libvirt,jfehlig/libvirt,crobinso/libvirt,eskultety/libvirt,olafhering/libvirt,eskultety/libvirt,crobinso/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,libvirt/libvirt,zippy2/libvirt,nertpinx/libvirt,libvirt/libvirt,jardasgit/libvirt,andreabolognani/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,olafhering/libvirt,jfehlig/libvirt,eskultety/libvirt,zippy2/libvirt,crobinso/libvirt,crobinso/libvirt,olafhering/libvirt,zippy2/libvirt,nertpinx/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,eskultety/libvirt,libvirt/libvirt,andreabolognani/libvirt,zippy2/libvirt,andreabolognani/libvirt,jfehlig/libvirt,nertpinx/libvirt,libvirt/libvirt,nertpinx/libvirt,olafhering/libvirt,nertpinx/libvirt,eskultety/libvirt,andreabolognani/libvirt