Merge branch 'stable-2.16' into stable-3.0

* stable-2.16:
  Bump bazel version to 1.0.0
  [ui] add a scrollbar when the overlay is too big
  Add autocomplete for groups
  Upgrade bazlets to latest stable-2.15 to build with 2.15.17 API

Change-Id: Id4f04729e718b36d19adbfb952ccf95402ba7221