find an open port when given a port range

this option is only done via this as a dep and should not be done via the cli.

so maybe the selenium server provider config:
```
{
  // port is okay if we know its going to be open
  portRangeStart: 4000,
  portRangeEnd: 5000,
  ...
}
```
Go through (starting at port 4000) and try to get a port that is open.