Fix 'is not a working copy' error for 'svn info path' when path
is a working copy root that contains an immediate child in a
tree-conflict.

* subversion/libsvn_wc/info.c
  (svn_wc__get_info): Use the parent directory of the tree-conflict
   rather than the parent directory of the target path.

* subversion/tests/cmdline/info_tests.py
  (info_with_tree_conflicts): Extend.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1515366 13f79535-47bb-0310-9956-ffa450edef68