On the log-message-templates branch, fix mishandling of relative or
unversioned paths in the commit target list.

* subversion/libsvn_client/commit_util.c
  (svn_client_get_log_message_templates): Make paths absolute before handing
   them off to svn_client_propget5(), else we'll run into an assert.
   If an unversioned path in the commit target list is found, which
   will happen during 'svn import', just skip it instead of erroring out.

Found by: basic_tests.py


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/log-message-templates@1623822 13f79535-47bb-0310-9956-ffa450edef68