When removing old repositories before re-creating them for tests, we don't 
need to be clean about it, so just recursively remove the directory. 

* subversion/tests/svn_test_fs.c
  (svn_test__create_repos): Just remove the target directory, rather than 
   just the repository.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1437354 13f79535-47bb-0310-9956-ffa450edef68