Move initialization of the secret to the pre_config hook. Use

ap_retained_data_*() because we don't have access to process->pool there.

This makes the code shorter and a lot more clear, but cannot directly be
backported to 2.2 which doesn't have ap_retained_data_*().


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1493257 13f79535-47bb-0310-9956-ffa450edef68