Fix some Ruby test failures introduced by r29076.
Fix some Ruby test failures introduced by r29076.

* subversion/libsvn_fs_base/fs.c
  (base_open): Delay the writing of the format file until after the
    databases have been opened/created.

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