Make it possible to configure connection timeout

[morco]

Big fan of this project, works very good in general, however one thing I found painfully missing when working with it is the possibility to set a custom value for the connection timeout. The wrapped upstream library JSch allows this principally, but unfortunately as far as I can tell not as a configuration map option, but only by directly manipulating the session object like this:

session.connect(int connectTimeout)

Or probably better like this:

session.setTimeout(int timeout)

To my understanding it is atm not possible to make sshoogr set this timeout parameter in clean fashion. You actually expose the session object inside the session delegate which is quite nice, but unfortunately doesn't help here as for setting the timeout to be meaningful it must obviously happen between the time frame of the session object being created and connect method being called on it, which is atm a "solid, non-interferable" block.
I think a workable solution could look similar to this monkey-patched version of the SessionDelegate connect method we use as a workaround for the moment:

void connect_with_to() {
  try {
    if (session == null || !session.connected || changed) {

      disconnect()

      if (host == null) {
        throw new SshException('Host is required.')
      }
      if (username == null) {
        throw new SshException('Username is required.')
      }
      if (keyFile == null && password == null) {
        throw new SshException('Password or key file is required.')
      }

      session = jsch.getSession(username, host, port)
      if (keyFile != null) {
        if (passPhrase) {
          jsch.addIdentity(keyFile.absolutePath, passPhrase)
        } else {
          jsch.addIdentity(keyFile.absolutePath)
        }
      }

      if (password) session.setPassword(password as String)

      if (proxyHost?.trim() && proxyPort?.trim()) {
        session.proxy = new ProxyHTTP(proxyHost, Integer.parseInt(proxyPort))
      }

      if (options.verbose) {
        logger.info(">>> Connecting to $host")
      }

// the following if-clause is the new interesting bit
      if (options.connectionTimeout != null) {
        session.setTimeout(con_timeout)
      }

      session.connect()
    }
  } finally {
    changed = false
  }
}

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