Convert the conf/hooks-env file created when making a new repo to be
conf/hooks-env.tmpl.

Just seems silly to parse a file that's fully commented out and that
many people may never use.

* subversion/libsvn_repos/repos.c
  (create_conf): Make the conf/hooks-env file be written as hooks-env.tmpl.
    Uncomment the sections that is in it.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1463801 13f79535-47bb-0310-9956-ffa450edef68