[vstest/acl table] Fix ports field in acl table creation

[wendani]

Signed-off-by: Wenda Ni [email protected]

What I did

Why I did it Be consistent with dvs_acl.create_acl_table

        table_attrs = { 
            "policy_desc": table_name,
            "type": table_type,
            "ports@": ",".join(ports)
        }   

How I verified it vs test

Details if related

[prsunny]

@wendani , does that mean old config should be failing?