Merge changes I1572338c,I39965007,I521753b1

* changes:
  logd: liblog: logcat: Add LogWhiteBlackList
  logd: prune by worst offending UID
  logd: liblog: logcat: Add Statistics
tree: 2550003ff5585b31b69f4d7398fb4b6026783853
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/