def list_nsgs_all(access_token, subscription_id):
endpoint = '<STR_LIT>'.join([get_rm_endpoint(),<EOL>'<STR_LIT>', subscription_id,<EOL>'<STR_LIT>',<EOL>'<STR_LIT>', NETWORK_API])<EOL>return do_get(endpoint, access_token)<EOL>
List all network security groups in a subscription.
    Args:
        access_token (str): a valid Azure Authentication token.
        subscription_id (str): Azure subscription id.
    Returns:
            HTTP response. JSON body of all network security groups in a subscription.