The libvirt package has a dependency on systemd-libs and systemd,
while the centos 7.1 container installs systemd-container-libs
and systemd-container. We don't need either of these systemd tools
but they reuslt in a broken build of the system if they are missing.
As is, the libvirt container will not build.
Change-Id: I8e5aac0e3a7e9d88a81733a3048971fe9d48ba56
f4319a9a21