Revert r1519126: JavaHL's ConfigEvent handler is connection-specific
again, not global. The reason for this reversion is that client may
want to adjust configuration based on a specific connection rather
than globally, and it's easier to do so if the callback objects can
store the per-connection parameters.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1539931 13f79535-47bb-0310-9956-ffa450edef68