Merge r1387110, r1387444, r1387979, r1387607, r1387693, r1407085, r1421953 from trunk:

Persist local balancer-manager changes across restart/graceful.


Use identifying server_rec info when we know we have
unique and useful data :)


fix clang warning (dead initialization)


Log whether or not the restore from shm actually
resulted in a match of shm data, or whether it
was stale.


and this one as well... persist isn't inherited


better logging for re-use/use of shm

Allow for searching w/i shm slots for a specific worker and balancer
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1436919 13f79535-47bb-0310-9956-ffa450edef68