Fix some piped log problems: bogus "piped log program '(null)'

failed" messages during restart and problem with the logger
respawning again after Apache is stopped.

PR:                21648, 24805


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@102048 13f79535-47bb-0310-9956-ffa450edef68