make some bundles arch-compatible, more default packages for arch

bundles/vmhost/metadata.py

@@ -3,7 +3,9 @@ defaults = {
         'packages': {
             'libvirt-clients': {},
             'libvirt-daemon-system': {},
+            'netcat-openbsd': {}, # for virt-manager
             'qemu-utils': {},
+            'qemu-kvm': {},
             'qemu-system-x86': {},
         },
     },
@@ -21,3 +23,6 @@ defaults = {
         },
     },
 }
+
+if node.has_bundle('zfs'):
+    defaults['apt']['packages']['libvirt-daemon-driver-storage-zfs'] = {}