'Adds default rules and their values to the given rules dict.
The given rulen dict may have an incomplete set of policy rules.
This method will add the default policy rules and their values to
the dict. It will not override the existing rules.'

def add_missing_default_rules(self, rules):

    for rule in policies.list_rules():
        if (rule.name not in rules):
            rules[rule.name] = rule.check_str
