netinfo clock skew warn too loud

keb> ok i got another of these with Tor 0.2.0.23-rc (running as client only) : Apr 17 12:52:19.184 [Warning] Received NETINFO cell with skewed time from server at 195.24.77.135:80. It seems that our clock is ahead by 2 hours, 15 minutes, or that theirs is behind. Tor requires an accurate clock to work: please check your time and date settings.

We only complain about skew for directory requests when int trusted = router_digest_is_trusted_dir(conn->identity_digest);

Perhaps we should do something similar for clients looking at netinfo cells?

[Automatically added by flyspray2trac: Operating System: All]