Password cannot be specified by conf

`parseUrl`'s documentation:

```
/**
   * Parses the JDBC Connection URL.
   * <p/>
   * The URL format is specified as following :
   * <ul>
   * <li> hostname which contains hosts on which grill server is
   * hosted parsed from authority section</li>
   * <li>port number if specificed in authority part.</li>
   * <li>db name from path</li>
   * <li>session settings from path, separated by ;</li>
   * <li>configuration settings separated by ; from query setting</li>
   * <li>variables setting separated by ;  from fragment</li>
   * </ul>
   * <p>
   * Examples :-
   * </p>
   * <code>
   * jdbc:grill://hostname:port/dbname;[optional key value pair of session settings]?[optional configuration settings for connection]#[optional variables to be used in query]
   * </code>
   *
   * @param uri to be used to connect to grill server
   * @return final list of connection parameters
   * @throws IllegalArgumentException if URI provided is malformed
   */
```

No mention of username or password.