[aws modules] use ec2_url in a few places it was missing (#33954)

lib/ansible/modules/cloud/amazon/ec2_placement_group.py

@@ -182,7 +182,7 @@ def main():
 
     connection = boto3_conn(module,
                             resource='ec2', conn_type='client',
-                            region=region, **aws_connect_params)
+                            region=region, endpoint=ec2_url, **aws_connect_params)
 
     state = module.params.get("state")
 

lib/ansible/modules/cloud/amazon/ec2_placement_group_facts.py

@@ -123,7 +123,7 @@ def main():
 
     connection = boto3_conn(module,
                             resource='ec2', conn_type='client',
-                            region=region, **aws_connect_params)
+                            region=region, endpoint=ec2_url, **aws_connect_params)
 
     placement_groups = get_placement_groups_details(connection, module)
     module.exit_json(changed=False, placement_groups=placement_groups)

lib/ansible/modules/cloud/amazon/ec2_vpc_net.py

@@ -273,7 +273,7 @@ def main():
     changed = False
 
     region, ec2_url, aws_connect_params = get_aws_connection_info(module, boto3=True)
-    connection = boto3_conn(module, conn_type='client', resource='ec2', region=region, **aws_connect_params)
+    connection = boto3_conn(module, conn_type='client', resource='ec2', region=region, endpoint=ec2_url, **aws_connect_params)
 
     if dns_hostnames and not dns_support:
         module.fail_json(msg='In order to enable DNS Hostnames you must also enable DNS support')