bundles/vmhost: add metadata reactor to add all admins to 'libvirt' group

bundles/vmhost/metadata.py

@@ -35,3 +35,21 @@ if node.has_bundle('nftables'):
             'pkg_apt:libvirt-daemon-system',
         },
     }
+
+
+@metadata_reactor.provides(
+    'users',
+)
+def libvirt_group_for_admins(metadata):
+    result = {}
+    for user, config in metadata.get('users', {}).items():
+        if config.get('is_admin', False):
+            result[user] = {
+                'groups': {
+                    'libvirt',
+                },
+            }
+
+    return {
+        'users': result,
+    }

nodes/home/nas.py

@@ -185,13 +185,11 @@ nodes['home.nas'] = {
             },
             'kunsi': {
                 'groups': {
-                    'libvirt',
                     'nas',
                 },
             },
             'sophie': {
                 'groups': {
-                    'libvirt',
                     'nas',
                 },
             },

nodes/htz/ex42-1048908.py

@@ -72,13 +72,6 @@ nodes['htz.ex42-1048908'] = {
                 '/dev/nvme1',
             },
         },
-        'users': {
-            'kunsi': {
-                'groups': [
-                    'libvirt',
-                ],
-            },
-        },
         'vm': {
             'cpu': 8,
             'ram': 64,

nodes/rx300.py

@@ -496,9 +496,6 @@ nodes['rx300'] = {
         'users': {
             'kunsi': {
                 'enable_linger': True,
-                'groups': {
-                    'libvirt',
-                },
             },
         },
         'zfs': {