Rate-limit unsafe socks warning

Pick 5 seconds as the limit. 5 seconds is a compromise here between
making sure the user notices that the bad behaviour is (still) happening
and not spamming their log too much needlessly (the log message is
pretty long). We also keep warning every time if safesocks is
specified, because then the user presumably wants to hear about every
blocked instance.

(This is based on the original patch by Sebastian, then backported to
0.2.2 and with warnings split into their own function.)

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