Initialize the SSH daemon.

def _StartSshd(self):
    """Initialize the SSH daemon."""
    # Exit as early as possible.
    # Instance setup systemd scripts block sshd from starting.
    if os.path.exists(constants.LOCALBASE + '/bin/systemctl'):
      return
    elif (os.path.exists('/etc/init.d/ssh')
          or os.path.exists('/etc/init/ssh.conf')):
      subprocess.call(['service', 'ssh', 'start'])
      subprocess.call(['service', 'ssh', 'reload'])
    elif (os.path.exists('/etc/init.d/sshd')
          or os.path.exists('/etc/init/sshd.conf')):
      subprocess.call(['service', 'sshd', 'start'])
      subprocess.call(['service', 'sshd', 'reload'])