Merge r487901 from trunk:

PR#37680: fix socket block/nonblock on restart/graceful
Patch submitted by Darius Davis (darius-abz free-range.com.au)

Submitted by: niq
Reviewed by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@488883 13f79535-47bb-0310-9956-ffa450edef68