Add a regression test including a node that is moved_from 3 times. This
can be used as a base for adding more tests for similar cases as issue #4436,
that shows that an local_abspath of a move source is not enough to find the
right layer in wc.db.

Currently at least our revert code has problems with these cases, but as the
code is similar to the update-move code we need more regression tests here.

After a few experiments with this wc I found a segfault in the conflict
resolver.

* subversion/tests/cmdline/move_tests.py
  (setup_move_many): New helper function.
  (move_many_update_delete): New test: passing
  (move_many_update_add): New test: triggering assertion

  (test_list): Add tests.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1530967 13f79535-47bb-0310-9956-ffa450edef68