swig-rb: Fix tests so they don't use users real configuration.

This prevents failures from for example auto-props being configured.

* subversion/bindings/swig/ruby/test/util.rb
  (SVNTestUtil.make_context): Load the config hash on the context from the
    config files in config_path.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1597884 13f79535-47bb-0310-9956-ffa450edef68