<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def host_info(host=None):
    '''
    Return information about the host connected to this master
    '''
    data = query(host, quiet=True)
    for id_ in data:
        if 'vm_info' in data[id_]:
            data[id_].pop('vm_info')
    __jid_event__.fire_event({'data': data, 'outputter': 'nested'}, 'progress')
    return data