Fix two svnadmin tests which corrupt an FSFS repository to work on unsharded (ie, --server-minor-version 4) repositories.
Fix two svnadmin tests which corrupt an FSFS repository to work on
unsharded (ie, --server-minor-version 4) repositories.

* subversion/tests/cmdline/svnadmin_tests.py
  (fsfs_file): New.
  (verify_incremental_fsfs,
   fsfs_recover_handle_missing_revs_or_revprops_file): Use helper.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@870517 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion