clean up socket definition... just the sock: path matters,
and we adjust relative to DefaultRuntimeDir

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1531929 13f79535-47bb-0310-9956-ffa450edef68
Update doccos about UDS

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1531930 13f79535-47bb-0310-9956-ffa450edef68