Check to see if a pool exists

    CLI Examples:

    .. code-block:: bash

        salt-run f5.check_pool load_balancer pool_name

def check_pool(lb, name):
    '''
    Check to see if a pool exists

    CLI Examples:

    .. code-block:: bash

        salt-run f5.check_pool load_balancer pool_name
    '''
    if __opts__['load_balancers'].get(lb, None):
        (username, password) = list(__opts__['load_balancers'][lb].values())
    else:
        raise Exception('Unable to find `{0}` load balancer'.format(lb))
    F5 = F5Mgmt(lb, username, password)
    return F5.check_pool(name)