Add fallback port numbers for invoking svnserve.
Add fallback port numbers for invoking svnserve.

* subversion/bindings/swig/ruby/test/util.rb
  (SvnTestUtil::setup_svnserve): Use available port number from a list
   of possible port numbers as port number for svnserve.

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