Try to unstick the JavaHL tests.

* subversion/bindings/javahl/native/OperationContext.cpp
  (TunnelContext::~TunnelContext): Close our end of the pipes.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1533856 13f79535-47bb-0310-9956-ffa450edef68