Refactor: Core: A faster and more consistant digest function

Combine the filtering and dumping stages when creating the input for
crm_md5sum().  xmlNodeDump() was sometimes super fast (<1s) but other
times super slow (4s or so) for the same input.
Log: More xml that needs to be explicitly enabled
Fix: crmd: Prevent use-after-free of fsa_message_queue during exit
Fix: pacemakerd: Ensure libqb blackbox files are cleaned up on exit
Fix: attrd_updater: Ensure libqb blackbox files are cleaned up on exit
Doc: Update todo list