Move JavaHL's ConfigImpl class to the "util" package.

* build.conf (private-built-includes): Note renamed generated header
   org_apache_subversion_javahl_util_ConfigImpl_Category.h.

[in subversion/bindings/javahl/src/org/apache/subversion/javahl]
* util/ConfigImpl.java: Renamed from ConfigImpl.java.
  Changed package name and imported ISVNConfig and ClientException.

[in subversion/bindings/javahl/native]
* OperationContext.cpp (OperationContext::notifyConfigLoad):
   Updated the ConfigImpl class name in class lookup.

* org_apache_subversion_javahl_util_ConfigImpl_Category.cpp:
   Renamed from org_apache_subversion_javahl_ConfigImpl_Category.cpp.
   Renamed all native wrapper functions to include the new package name.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1518939 13f79535-47bb-0310-9956-ffa450edef68