Return names of all load balancers associated with an account

    CLI example:

    .. code-block:: bash

        salt myminion boto_elb.list_elbs region=us-east-1

def list_elbs(region=None, key=None, keyid=None, profile=None):
    '''
    Return names of all load balancers associated with an account

    CLI example:

    .. code-block:: bash

        salt myminion boto_elb.list_elbs region=us-east-1
    '''

    return [e.name for e in get_all_elbs(region=region, key=key, keyid=keyid,
                                         profile=profile)]