Fix inherited props on switched nodes after upgrade from 1.6 working copy.

* subversion/libsvn_wc/entries.c
  (struct db_node_t): Add inherited_props member.
  (insert_node): Bind inherited props.
  (is_switched): New.
  (write_entry): Empty cache on switched nodes.

* subversion/tests/cmdline/upgrade_tests.py
  (iprops_upgrade1_6): Mark PASS.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1476254 13f79535-47bb-0310-9956-ffa450edef68