Merge changes I7ebb6146,I0b42736c,I5331acde
am: df7c1ed

* commit 'df7c1ed3a06c60d77865ff8d71b2f30ca94693a7':
  logcat: expand -n, -r and -b
  logcat: allow comma-separate list of buffers
  logcat: Adjust help to make it more meaningful

Change-Id: I2341e07713e14e1e449bf41a194e306526246959