[rancid] Filter/Change filesize thresholds IOS-XE/NXOS

[Kenneth Lind]

We have been long time members of this list and see similar issues mentioned but we would like to be able to fine tune some of the controls related to how diffs are generated in relation to file size changes such as the following:

NXOS:
- !Flash: logflash: 7 GB total (89% free)
+ !Flash: logflash: 7 GB total (90% free)

IOSXE:
- !Flash: harddisk: 118084341760 bytes total (104 GB free)
+ !Flash: harddisk: 118084341760 bytes total (103 GB free)


We are on RANCiD latest (v3.9) and everything is working great as always. I would simply like to reduce the chatter emails. We know we can remove the checks altogether but think there is a more elegant solution that would perhaps allow us to not care about the 1GB changes (as big logs sometimes churn on our IOS-XE devices).

Thank you Heasley and everyone that has made this such a great product!

--Ken