Test tree conflicts with an incoming replacement on 'switch'.  This follows
r1449428 which started testing tree conflicts with an incoming replacement
on 'update', and then r1449413 which fixed 'switch' to notice ancestry like
'update' does so that it too can detect tree conflicts in these scenarios.

* subversion/tests/cmdline/tree_conflict_tests.py
  (up_sw_file_del_onto_mod,
   up_sw_file_del_onto_del,
   up_sw_dir_del_onto_mod,
   up_sw_dir_del_onto_del): Test incoming replacements with 'switch' just
    like we already do with 'update', and remove the comment about why we
    were not doing so.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1450582 13f79535-47bb-0310-9956-ffa450edef68