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log: implement log_verbose and VERBOSE log level.

We don't have any intermediate log level between INFO and DEBUG.
INFO level should be used for rare events, such as becoming a
master or accepting a replica join. INFO is the default level.

We lack a log level for "hard to debug" situations, usable
by system administrators.

Introduce a new new log level for this purpose, VERBOSE,
for verbose output.

This change should not affect any existing installations.

Update module-api.c test.

Fixes gh-2467.

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