SWIG bindings: Decouple Ruby tests.
SWIG bindings: Decouple Ruby tests.

* subversion/bindings/swig/ruby/test/test_client.rb
  Require "svn/ra" for test_open_ra_session().

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion