configures address-families when vrf is created (#28615)

* configures address-families when vrf is created

fixes #26725

* fix up unit test cases

lib/ansible/modules/network/ios/ios_vrf.py

@@ -167,7 +167,11 @@ def get_interface_type(interface):
 
 def add_command_to_vrf(name, cmd, commands):
     if 'vrf definition %s' % name not in commands:
-        commands.append('vrf definition %s' % name)
+        commands.extend([
+            'vrf definition %s' % name,
+            'address-family ipv4', 'exit',
+            'address-family ipv6', 'exit',
+        ])
     commands.append(cmd)
 
 def map_obj_to_commands(updates, module):
@@ -185,7 +189,11 @@ def map_obj_to_commands(updates, module):
             continue
 
         if not have.get('state'):
-            commands.append('vrf definition %s' % want['name'])
+            commands.extend([
+                'vrf definition %s' % want['name'],
+                'address-family ipv4', 'exit',
+                'address-family ipv6', 'exit',
+            ])
 
         if needs_update(want, have, 'description'):
             cmd = 'description %s' % want['description']
@@ -337,6 +345,9 @@ def check_declarative_intent_params(want, module):
 
         if rc == 0:
             data = out.strip().split()
+            # data will be empty if the vrf was just added
+            if not data:
+                return
             vrf = data[0]
             interface = data[-1]
 
@@ -356,6 +367,7 @@ def main():
         name=dict(),
         description=dict(),
         rd=dict(),
+
         interfaces=dict(type='list'),
 
         delay=dict(default=10, type='int'),