Propose ab patch for minor problem detected

during 2.4.32 testing (thanks to Joe for pointing
out the trunk fix) and two more small changes
bringing 2.4 ab in sync with trunk ab.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1826799 13f79535-47bb-0310-9956-ffa450edef68