Merge changes I11d7c55a,Id4db5f48,I89f7c922

* changes:
  Add a unit test for BandwidthController quota commands.
  Support pretending that certain iptables commands failed.
  Move createTunInterface to its own test file for use elsewhere.
tree: fefcd210cfb2f711ec9eb526a7b81d7ea3c031aa
  1. client/
  2. include/
  3. server/
  4. tests/
  5. Android.mk
  6. MODULE_LICENSE_APACHE2
  7. NOTICE