Merge r1201443 from trunk:

add per-dir config merging to mod_lua so LuaHook* in multiple per-dir sections
behaves as expected instead of discarding previous sections.


Reviewed by: covener


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1201445 13f79535-47bb-0310-9956-ffa450edef68