Return the ip associated with the named host

    CLI Example:

    .. code-block:: bash

        salt '*' hosts.get_ip <hostname>

def get_ip(host):
    '''
    Return the ip associated with the named host

    CLI Example:

    .. code-block:: bash

        salt '*' hosts.get_ip <hostname>
    '''
    hosts = _list_hosts()
    if not hosts:
        return ''
    # Look for the op
    for addr in hosts:
        if host in hosts[addr]:
            return addr
    # ip not found
    return ''