make_sni.sh test -- Accomodate for platforms which do not have RANDOM in their...

make_sni.sh test -- Accomodate for platforms which do not have RANDOM in their sh(1) implementation - rely on the pid and a not so random prefix

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@757851 13f79535-47bb-0310-9956-ffa450edef68