got{web,}d: handle multiple -v only fatal*() and log_warn*() are now logged by default. log_info() is hidden behind a -v and log_debug behind -vv. Makes gotd and gotwebd way less chatty. ok stsp@

got{,web}d: unify log.c gotd and gotwebd are using almost the same log.c file, so unify. This only slightly changes gotwebd logs to include the process name, like gotd. ok stsp@