2b7b9895cbc258db268fcf778a28cf7d6abc83cc

Reduces the default Trail size from 20,000 to 100 and changes it to grow exponentially rather than linearly. This should reduce the amount of garbage created during rule execution as Trail will better fit the working set. Change-Id: Ia240ecd0db00aa8a2952f107f8259742575fd700
Description
RETIRED, Gerrit as used by OpenStack