Improve our logging of the "how do I commission this" information. (#10285)
Improve our logging of the "how do I commission this" information. (#10285)

Two changes here:

1) On "linux" (which includes Darwin), don't claim the BLE rendezvous
   mode when we don't even have the BLE network layer compiled.

2) On "linux" add device config and QR code logging right after server
   startup, so it's easier to notice when the server starts.  I left
   the existing such logging at the very beginning of startup, so it
   also appears at the very beginning of the log, for people who
   prefer finding it there.
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