Merge branch 'stable-2.16' into stable-3.0

* stable-2.16:
  Fix the testAllNumericUserGroup all-numeric username
  Test all-numeric username

Change-Id: I26b459a5c835f1fbf8d3d07107881fb1952ecc27
tree: 6578e7fafdebfa7fd82fd1f25c7620c525186a4a
  1. .gitignore
  2. .settings/
  3. BUILD
  4. LICENSE
  5. src/