Warnings on startup from cached descriptors and invalid time in mtbf history

http://asteria.noreply.org/~weasel/.loud-tor includes

Bug #1: Oct 27 12:43:14.706 [warn] Got invalid ISO time "1969-11-08 08:36:56". (Before 1970) Oct 27 12:43:14.706 [warn] Couldn't parse started-tracking time in mtbf history file.

Bug legacy/trac#2 (closed): perhaps we shouldn't bitch to the log when we have complaints (or at least certain complaints) about a descriptor we read from the cache.

[Automatically added by flyspray2trac: Operating System: All]

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