Reconnect support

[torkildr]

It would be nice to have reconnect ability built into the library somewhere.

This would remove the need to have

xapi
    .on('close', () => {})
    .on('error', (error) => {});

with reconnect logic in client code.

Today, to have reconnect ability, you will have to have event listeners on close and error, which will create a new xapi object, and re-register all feedbacks.

[drkchiloll]

I probably should have answered this some time ago..Using the Error Event is good practice from my usage..but to keep a connection alive use the following:

xapi.connect('ssh://ip', {
  ...credentials
  keepaliveInterval: IntegerMilliseconds

[drkchiloll]

Ultimately, this module uses the SSH2 module here: https://github.com/mscdex/ssh2, some of the properties and events for SSH2 are good to know for this module..some methods and properties may not work..your mileage of incorporating these may vary...