Some usability adjustments in update.sh

  Making it halt on error
  Removing the need to run lunch first
  Removing the empty staging dir

Bug: 155906507
Test: ./update.sh 6508549

Change-Id: Ic2fdc664f73d3249a2de45d6c99e99edd7400171
1 file changed
tree: da989f9bf4d47129e7b21d56e9a928e0414a8866
  1. darwin-x86/
  2. linux-x86/
  3. manifest.xml
  4. update.sh