A couple of minor RPZ cleanups

Closed Tony Finch requested to merge fanf/bind9:u/fanf2/rpz-cleanup into master

Two patches in this MR:

  1. a log message formatting fix;

  2. teach RPZ what to do with synth-from-dnssec. This one needs sanity checking from someone who understands these better than me!

Draft CHANGES entry:

[cleanup]	Formatting and logic fixes for RPZ debug logging.

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