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

Author: lyarwood

gate/test_evacuate.sh

@@ -64,6 +64,7 @@ openstack --os-compute-api-version 2.11 compute service set --down ${subnode} no
 
 echo "Stopping libvirt on the localhost before evacuating to trigger failure"
 sudo systemctl stop libvirt-bin
+sudo systemctl stop libvirtd
 
 # Now force the evacuation to *this* host; we have to force to bypass the
 # scheduler since we killed libvirtd which will trigger the libvirt compute
@@ -98,6 +99,7 @@ evacuate_and_wait_for_error evacuate-bfv-test
 
 echo "Now restart libvirt and perform a successful evacuation"
 sudo systemctl start libvirt-bin
+sudo systemctl start libvirtd
 sleep 10
 
 # Wait for the compute service to be enabled.