Making logging to MongoDB the default

[Aaron Bentley]

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> The main issue I can see is that once rsyslog based logging is
> turned off we lose the all-machines.log file which some people and
> systems no doubt rely on. The logs for an environment can of course
> still be retrieved using the "juju debug-log" command.

all-machines.log is one of many log files CI stores so that failures
can be debugged afterwards.

Aaron
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