On the 'log-message-templates' branch: add a very rough-cut
implementation of log message template support to 'svn'.

* subversion/svn/util.c
  (get_log_msg_template): New helper function.
  (svn_cl__get_log_message): Use get_log_msg_template() to fetch the
    contents of any (and all) log message templates associated with the
    commit items.

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/log-message-templates@1487959 13f79535-47bb-0310-9956-ffa450edef68