[RFC][PATCH 21/22] JavaHL Ra API Implementation

[[[
    JavaHL: Expose additional methods publicly so that readonly tests can
use them to setup a single shared readonly test repository to speed up tests

    [ in subversion/bindings/javahl/test/org/tigris/subversion/javahl/ ]

    * SVNTests.java:
      (USERNAME, PASSWORD): Make test username and password publicly
available constants
      (setUp): Make the method public
      (DefaultPromptUserPassword): make the class public.
      (prompt): Return true so that the getPassword() and getUsername()
methods are called by the JNI code
      (getConf): New method to retreive test configuration directory
      (getGreeksRepoUrl): New method to retreive URL to the shared test repo
]]]