[rancid] Cisco 10k sflog Timestamp Cycling

[Kenneth Lind]

We recently implemented IPDR on our Cisco 10K uBRs and are now receiving
diffs for every rancid run about the timestamp for the sflog:

- !Flash: 6            0 Oct 22 2013 08:46:10 -04:00 sflog
+ !Flash: 6            0 Oct 22 2013 09:37:28 -04:00 sflog

We are running Rancid v2.3.6 which according to the change log included the
fix for this issue (though in our instance it does not appear to be
filtered, unless there is an option somewhere that we've missed to enable
the filtering):

rancid: filter sflog from DirSlotN() for IOS on cisco 10k

I've been able to find mentions of the issue in the discuss archives, but
none have included a solution. Has anyone been able to hush the diffs for
the sflog outside of creating a new rancid type and altering the command
table to exclude the DirSlotN run?