[Evaluator] evaluator will only nominate candidates

As all score will be handles by scorer, remove the evaluate function
from  each evaluator. evaluator will only nominate candidates to the
scorer.

Bug: 141019662
Test: atest android.net.wifi
Test: atest com.android.server.wifi
Change-Id: I996dd19aa0e67051fe8003d7c621e4f75f73db38
13 files changed
tree: 462da609f14c473f5ba0d71c84d84075dec48270
  1. apex/
  2. service/
  3. PREUPLOAD.cfg