xendomains: remove libvirtd conflict

Conflicting with libvirtd is fine for upstream, where xl/libxl is king.
But down the SUSE stream, we promote libvirt and all the libvirt-based
tools. If a user installs libvirt on their SUSE Xen host, then libvirt
should be king and override xendomains.

bsc#1015348
Index: xen-4.8.0-testing/tools/hotplug/Linux/systemd/xendomains.service.in
===================================================================
--- xen-4.8.0-testing.orig/tools/hotplug/Linux/systemd/xendomains.service.in
+++ xen-4.8.0-testing/tools/hotplug/Linux/systemd/xendomains.service.in
@@ -5,7 +5,6 @@ After=proc-xen.mount xenstored.service x
 After=network-online.target
 After=remote-fs.target
 ConditionPathExists=/proc/xen/capabilities
-Conflicts=libvirtd.service
 
 [Service]
 Type=oneshot