Summary:
I've added a verbosity level to help keep the BOLT spewage to a minimum.
The default level is pretty terse now, level 1 is closer to the original,
I've saved level 2 for the noisiest of messages. Error messages should
never be suppressed by the verbosity level only warnings and info messages.
The rational behind stream usage is as follows:
outs() for info and debugging controlled by command line flags.
errs() for errors and warnings.
dbgs() for output within DEBUG().
With the exception of a few of the level 2 messages I don't have any strong feelings about the others.
(cherry picked from FBD3814259)
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