WIP: [Issue 1232] Export zone timers via stats channel

Closed Paul Frieden requested to merge (removed):1232-stats-channel-zone-timers-9_15 into master

This patch adds the loaded, expires, and retry timers to the zone info in the statistics channel. This makes it much easier to monitor for zones that are due to expire soon. The code seems to build cleanly, and the server passes make check. I'm open to adjusting the formatting of these or making additional code modifications.

The same basic code works in 9.11 and 9.14 as well, so this could be easily backported.

Closes #1232 (closed)

Edited by Michał Kępień

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