DEVEL15-windows-daemon-threads-shutdown-sync-20071223

DEVEL15-windows-daemon-threads-shutdown-sync-20071223

LICENSE MIT

Windows Error Reporting received crashes caused by a failure to synchronize
the shutdown of the AFS client service with the background daemon threads.
The daemon threads (cm_Daemon, cm_BkgDaemon+, cm_IPAddrDaemon) could be
accessing data structures as they were being freed or unmapped.

Add synchronization mechanisms to signal the termination of the threads
with the shutdown of the service.

(cherry picked from commit 8a923a199d91aae6d1fc9bb6a2f1856fe5dbcb07)