Merge r1651088 from trunk:

Update conn_rec.id when a new thread begins working on a connection, because
the old thread may work on a new connection and assign the same ID in parallel.


Submitted By:  Michael Thorpe
Committed By: covener



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1651656 13f79535-47bb-0310-9956-ffa450edef68