'Determine if a serviceaccount actor is specified.
return: [list of AuditIssues]'

def _actor_role(self, policies, error_cat='SA'):

    errors = []
    for policy in policies:
        role = policy.get('Role')
        if (role and (role == 'iam.serviceAccountActor')):
            ae = make_audit_issue(error_cat, 'POLICY', 'ROLE', 'ACTOR')
            errors.append(ae)
    return errors
