def __init__(self, host_files, poll_interval=2.0, private_key=None, verbose=False):

        self.host_files = host_files
        self.poll_interval = poll_interval
        self.private_key = private_key
        self.tailers = {}
        self.verbose = verbose
host_files is a dictionary whose keys must correspond to unique
dataset/ETHPy150Open praekelt/python-sshtail/sshtail/tailers.py/SSHMultiTailer.__init__