test_evacuate.sh: Support libvirt-bin and libvirtd systemd services
test_evacuate.sh: Support libvirt-bin and libvirtd systemd services

The systemd service unit for libvirtd has changed name from libvirt-bin
to libvirtd, as such the evacuation test script needs to be changed to
support both as we move between these versions.

Change-Id: I49dc963ada17a595232d3eb329d94632d07b874b

openstack/nova,klmitch/nova,klmitch/nova,klmitch/nova,klmitch/nova,openstack/nova,mahak/nova,mahak/nova,openstack/nova,mahak/nova