logd: best 2/3 filter for timezone glitches

klogd is sensitive to changes in timezone resulting in glitches
surrounding conversion to local realtime logging. logger manages
a map from monotonic to realtime, but the process is racey since
the system can change the timezone at any time, this catches those
cases where it glitches.

Bug: 21868540
Change-Id: I03de6675fcd04f18ba7306a24dc3d9e750d86976