Merge changes I7ebb6146,I0b42736c,I5331acde am: df7c1ed
am: 453139a

* commit '453139a2a00d1e81919539ea32cd7a897182b973':
  logcat: expand -n, -r and -b
  logcat: allow comma-separate list of buffers
  logcat: Adjust help to make it more meaningful

Change-Id: I0b4c2b76f17ed4d6497df6357b7cd4728a5d3b40