Fix faulty completeness check in test suite after svnadmin hotcopy.

* subversion/tests/cmdline/svnadmin_tests.py
  (check_hotcopy_fsfs_fsx): Lock files are auto-create, thus, may be
                            missing on *either* side of the hotcopy.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1588897 13f79535-47bb-0310-9956-ffa450edef68