Follow up to r1527220/r1588852:

Implement better error checking/reporting around notification of abrupt parent
process termination.

It is likely that something bad is happening here based on these
user reports:

https://www.apachelounge.com/viewtopic.php?p=27848
http://mail-archives.apache.org/mod_mbox/httpd-users/201406.mbox/%3CCAC%2BRZnuwLD%2BJnoy2TYO8oeAWt6bFLMa%3DEhfDf9hS3cuuGUHXAw%40mail.gmail.com%3E



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1606368 13f79535-47bb-0310-9956-ffa450edef68