Since ProxyHC* values are per-server, we need to loop thru all per-server

contexts. No need for each server/vhost to have it's own watchdog instance,
however.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1784227 13f79535-47bb-0310-9956-ffa450edef68