Follow-up to r1298434 and r1298465, fix the long broken Ruby binding tests
on Windows.

Previously, when setting up the test sandbox, we tried to import from a 
temporary path, which correctly contained the Greek tree to import, but 
also contained the WC and repository.  The latter led to these types of 
errors as we tried to import the repository into itself:

Svn::Error::SvnError: 720033: Can't read file 
'C:\Users\pburba\AppData\Local\Temp\d20130510-13008-qz1kfs\repos\db\txn-prot
orevs\0-0.rev-lock': The process cannot access the file because another 
process has locked a portion of the file.  
C:/SVN/src-trunk/subversion/bindings/swig/ruby/svn/util.rb:99:in 
`svn_client_import3'
C:/SVN/src-trunk/subversion/bindings/swig/ruby/svn/util.rb:99:in `import3'
C:/SVN/src-trunk/subversion/bindings/swig/ruby/svn/client.rb:232:in `import'
C:/SVN/src-trunk/subversion/bindings/swig/ruby/test/greek_tree.rb:66:in 
`setup'
C:/SVN/src-trunk/subversion/bindings/swig/ruby/test/util.rb:224:in 
`setup_greek_tree'
C:/SVN/src-trunk/subversion/bindings/swig/ruby/test/util.rb:204:in 
`make_context'
C:/SVN/src-trunk/subversion/bindings/swig/ruby/test/util.rb:224:in 
`setup_greek_tree'
C:/SVN/src-trunk/subversion/bindings/swig/ruby/test/test_client.rb:1520:in 
`test_dir_prop'

* subversion/bindings/swig/ruby/test/greek_tree.rb

  (SvnTestUtil.Greek.initialize): Add import_path parameter and assign to a
   class variable.

  (SvnTestUtil.Greek.setup): Use new import_path class variable as the source
   for imports, rather than the tmp_path class variable, which also contains
   the WC and repository.

* subversion/bindings/swig/ruby/test/test_client.rb

  (SvnClientTest.test_import,
   SvnClientTest.test_import_custom_revprops): Create a dedicated import
   directory as a child directory of the class variable tmp_path, rather
   than using tmp_path itself -- again, that contains the WC and repository.

* subversion/bindings/swig/ruby/test/util.rb

  (SvnTestUtil.setup_default_variables): Remove unused class variable.  Add
   a dedicated class variable which is a sibling of the WC and repos paths,
   rather than their parent.

  (SvnTestUtil.setup_basic): Setup the new import path.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1482536 13f79535-47bb-0310-9956-ffa450edef68