Merge changes Icc984f40,Ie4c46bc9,I0f238985,I63a729d2,I2b5900a2

* changes:
  logd: clearAll by UID speedup
  logd: clear return and deal with busy if readers locked
  logd: update region lock after entry has passed to reader socket
  logcat: do not exit buffer loop on error
  logd: clientHasLogCredentials false negatives