Port parameter must be an integer

```
bevan@Grizzly-Shoulder-2.local:~
> obehave test -p foo

Error: Argument port must be an integer. 'foo' is not valid.


bevan@Grizzly-Shoulder-2.local:~
> obehave test -p 12.34

You must set an api key variable, either by setting as an environment variable or by passing in the `--api-key` parameter.
```