ab would start up more connections than needed, then quit when the

desired number were finished. Also fixed a logic error involving
ab keepalives.

Submitted by:	Victor J. Orlikowski
Reviewed by:	Roy Fielding


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@85855 13f79535-47bb-0310-9956-ffa450edef68