Autofailover: Make CPU throttling safer

Part 1 of this fix is to reduce cpu_throttle.go constants

• MAX_THROTTLE_ADJUST_MS from 1000 to 100
• MAX_THROTTLE_DELAY_MS from 10,000 to 100
  as the originals are much too large (e.g. see MB-49501).

We may need to reduce these further, even up to knocking another factor of 10 off each.

We may also wish to disable throttling by default (this is my preference as lowest-risk solution, especially as currently lacking evidence that throttling does more good than harm).

The current MB is to address MB-49501 (Korrigan Clark) and other problems with original CPU throttling.