Merge r693120, r720250 from trunk:

Add in useful feature. %k which logs the keepalives
value.
PR: 45762
        Dan Poirier <poirier@pobox.com>


Make %k work as it should. No regression noted in perl
test framework.

Reviewed by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@721033 13f79535-47bb-0310-9956-ffa450edef68