Comment 63 for bug 1529079

Description of problem:

libvirt's virSystemdCreateMachine (src/util/virsystemd.c) calls the systemd API `CreateMachineWithNetwork` via D-Bus to register machines. It works fine until systemd 225. However, with systemd 229, the `Before` property that is passed isn't accepted anymore and thus, makes the registration and creation of machines to fail.

Version-Release number of selected component (if applicable):

libvirt 1.2.17 (13.el7_2.5)
systemd 229 (+PAM +AUDIT +SELINUX +IMA -APPARMOR +SMACK -SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT -GNUTLS -ACL +XZ -LZ4 +SECCOMP +BLKID -ELFUTILS +KMOD -IDN)

Steps to Reproduce:

0. Get an Ubuntu Xenial VM
1. apt-get install qemu-kvm libvirt-bin
2. Follow instructions at https://wiki.ubuntu.com/SergeHallyn_libvirtnest , in particular:
     a. wget http://people.canonical.com/~serge/cdboot.xml
     b. wget -O mini.iso http://archive.ubuntu.com/ubuntu/dists/precise/main/installer-amd64/current/images/netboot/mini.iso
     c. qemu-img create cdboot.img 1G
     d. virsh define cdboot.xml
     e. virsh start cdboot
3. now apt-get install systemd-container
4. now virsh destroy cdboot; virsh start cdboot; it should fail

(https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1529079/comments/39)

Actual results:

libvirtError: Cannot set property Before, or unknown property.

Expected results:

- The machine should be started properly:
     a. `Before` shouldn't be passed,
     b. `After` should probably not be passed either,
- A systemd registration failure should maybe not be critical.

Additional info:

Issue reproduced on Ubuntu Xenial & CoreOS >1010.