Recover some reverted status report code

https://github.com/gem/oq-engine/pull/985 reverted some of the logging/queue status reporting that I had added in
https://github.com/gem/oq-engine/pull/984. The exact commit where I added these changes is: https://github.com/larsbutler/oq-engine/commit/6cfc3f4f55f3a90ab89d590ea94db38acf8433c5