write a debug message to the log when we're stuck in the sicko state

of trying to take over scoreboard slots that aren't going to be released
(we could also be stalled while taking over slots if a thread in child
gracefully terminating is serving a long-running request)

update a comment describing the sicko state to remove any information
I'm not absolutely sure of


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@94059 13f79535-47bb-0310-9956-ffa450edef68