Add a new inventory group so you can see instances in a particular VPC

plugins/inventory/ec2.py

@@ -433,6 +433,10 @@ class Ec2Inventory(object):
             if self.nested_groups:
                 self.push_group(self.inventory, 'keys', key_name)
 
+        # Inventory: Group by VPC
+        if instance.vpc_id:
+            self.push(self.inventory, self.to_safe('vpc_id_' + instance.vpc_id), dest)
+
         # Inventory: Group by security group
         try:
             for group in instance.groups: