Fix for failing build under travis-ci.

This was caused, the `urlparse` module in travis-ci does not understand the non-standard scheme, like `serf` in URI.

Ran the code like this under travis-ci,

```python
>>> uri = 'serf://127.0.0.1:7373/?AuthKey=key'
>>> import urlparse
>>> _parsed = urlparse.urlparse(uri, )
>>> _parsed.path = '/?AuthKey=key'
>>> _parsed.query = ''
```

But it should be in normal environment,

```python
>>> _parsed.path = '/'
>>> _parsed.query = '?AuthKey=key'
```