Merge r1413732, r1418752:

      various mods: host and URI escaping:

    Be sure to escape potential troubled strings

    add missing html escaping

Submitted by: jim, sf
Reviewed by: covener, minfrin, sf



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1418941 13f79535-47bb-0310-9956-ffa450edef68