Expose new config file keys in JavaHL.

* subversion/bindings/javahl/src/org/apache/subversion/javahl/ISVNConfig.java
  (ISVNConfig.ENABLE_MAGIC_FILE,
   ISVNConfig.SQLITE_BUSY_TIMEOUT,
   ISVNConfig.SERF_LOG_COMPONENTS,
   ISVNConfig.SERF_LOG_LEVEL): New constants.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1604448 13f79535-47bb-0310-9956-ffa450edef68