control socket logging is too noisy
On busy systems the control socket is too noisy.
Originally I thought it is a "security"/"audit" feature that all the traffic will get into kresd logs, but it turns out that some users use the API heavily and this leads to voluminous and at the same time useless log.
Proposal: Log socket communication only if verbose mode is enabled.
Better solution would be fine-grained logging configuration (#527) but that's out out of scope of this ticket.