Replace many local reimplementations of svntest.actions.verify_disk() with
a call to this standard function.

* subversion/tests/cmdline/changelist_tests.py
  (propmods_with_changelists):

* subversion/tests/cmdline/copy_tests.py
  (copy_replace_with_props,
   revision_kinds_local_source,
   copy_added_paths_with_props,
   copy_peg_rev_local_files,
   copy_peg_rev_local_dirs):

* subversion/tests/cmdline/merge_tests.py
  (merge_added_subtree):

* subversion/tests/cmdline/prop_tests.py
  (make_local_props,
   props_on_replaced_file,
   rm_of_replaced_file,
   obstructed_subdirs):

* subversion/tests/cmdline/svnadmin_tests.py
  (load_and_verify_dumpstream):

* subversion/tests/cmdline/revert_tests.py
  (revert_replacement_with_props,
   revert_file_merge_replace_with_history,
   revert_after_second_replace,
   revert_with_unversioned_targets):
     Replace local code by call to verify_disk()

* subversion/tests/cmdline/svntest/actions.py
  (run_and_verify_checkout2): Replace local reimplementation with call to
    verify_disk().

  (verify_update): Extract disk verification code from here and place it into
  (verify_disk): .. this function, that used to call verify_update.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1436012 13f79535-47bb-0310-9956-ffa450edef68