Add two tests for 'svnadmin recover/hotcopy' failing with non-empty old FSFS
repositories (--compatible-version=1.3 / 1.2 / 1.1).

* subversion/tests/cmdline/svnadmin_tests.py
  (recover_old): Rename this...
  (recover_old_empty): ...to this.  This helps to distinguish between old and
    new tests for similiar cases.  Also, tweak the docstring for consistency.
  (fsfs_recover_old_non_empty): New test for the erroneous 'svnadmin recover'
    behavior.  Marked as XFail.
  (fsfs_hotcopy_old_non_empty): New test for the erroneous 'svnadmin hotcopy'
    behavior.  Marked as XFail.
  (test_list): Add references to new tests and update reference to the
    renamed test.

Patch by: Evgeny Kotkov <evgeny.kotkov{_AT_}visualsvn.com>