Setup the server start time correctly. This also gets the server uptime

to be reported correctly.  I have also moved this code into a common
location, so that individual MPMs do not need to worry about setting up
the start time.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@87994 13f79535-47bb-0310-9956-ffa450edef68