Fix SSL usage in TestSuite

TestSuite.BaseUrl() only works for http, and if you try to use SSL with the most recent commits you have this kind of error:
```
Post http://127.0.0.1:46086/c/a: malformed HTTP response "\x15\x03\x01\x00\x02\x02\x16"
```

This patch fixes it.
Now I have a self-signed certificate issue, oh well...