returns the salt_id name of the Vagrant VM

    :param machine: the Vagrant machine name
    :param cwd: the path to Vagrantfile
    :return: salt_id name

def get_machine_id(machine, cwd):
    '''
    returns the salt_id name of the Vagrant VM

    :param machine: the Vagrant machine name
    :param cwd: the path to Vagrantfile
    :return: salt_id name
    '''
    name = __utils__['sdb.sdb_get'](_build_machine_uri(machine, cwd), __opts__)
    return name