Fixed Issue #2214: poor error message when intermediate dir missing in copy.

   * subversion/tests/clients/cmdline/copy_tests.py
     (url_2_non_existent_url_path): Added to test
     'svn cp' into a directory path in which
     one of the ancestral folder doesnt exist.

   * subversion/libsvn_repos/commit.c
     (open_directory): Removed call of
     out_of_date() and added appropriate error 
     message.