libvirt-guests.service does both suspend *and* resume guests,
depending on whether it's being started or stopped: the
description should reflect this, to avoid confusing messages
during startup.
Replace "active" with "running" (to match virsh list's output)
and don't capitalize libvirt.
[Unit]
-Description=Suspend Active Libvirt Guests
+Description=Suspend/Resume Running libvirt Guests
After=network.target libvirtd.service time-sync.target
Documentation=man:libvirtd(8)
Documentation=http://libvirt.org