'Get a list of services.
:param host: destination host name.'

def list(self, host=None, binary=None):

    url = '/os-services'
    filters = []
    if host:
        filters.append(('host', host))
    if binary:
        filters.append(('binary', binary))
    if filters:
        url = ('%s?%s' % (url, urllib.parse.urlencode(filters)))
    return self._list(url, 'services')
