Issue #2419: 'svn rm' of schedule add leaves working props file

* wc/svn.2419/subversion/libsvn_wc/adm_ops.c
(svn_wc_delete2): Modified to handle properties set on
scheduled add files.

* subversion/tests/clients/cmdline/prop_tests.py
(removal_schedule_added_props): New test for testing property
removal on the removal of a schedule added file.
(test_list): Added new test.