Jeff Mitchell 9a980d34c7
Fix leader info repopulation (#6167)
* Two things:

* Change how we populate and clear leader UUID. This fixes a case where
if a standby disconnects from an active node and reconnects, without the
active node restarting, the UUID doesn't change so triggers on a new
active node don't get run.

* Add a bunch of test helpers and minor updates to things.
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