It seems twisted wants to see the protocol as well, not just a bare port
number. Without this we got:
```
exceptions.ValueError: Unknown endpoint type: '8010'
```
I noted when looking at the file that it was a bit messy because it used a mix of 2 and 4 spaces as indentation width in the YAML. [yamllint](https://github.com/adrienverge/yamllint) also showed warnings about the same things.
I cleaned the file up, so that the indentation would be harmonized and give people a better first impression of a great tool (=buildbot).
