def __init__(self, command, banner, shell=False, timeout=None, sleep=0.1):
"""
Initialize OutputExecutor executor.
:param str command: command to run to start service
:param str banner: string that has to appear in process output -
should compile to regular expression.
:param bool shell: see `subprocess.Popen`
:param int timeout: time to wait for process to start or stop.
if None, wait indefinitely.
:param float sleep: how often to check for start/stop condition
"""
Executor.__init__(self, command, shell, timeout, sleep)
self._banner = re.compile(banner)
