mod_lua: Fully sync 2.4.x with trunk (catch up to r1490700).
backport r1439027
Expand mod_lua stack size to fit image and readdress the remaining modules



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1491922 13f79535-47bb-0310-9956-ffa450edef68