Add PollingCheck utility to host-side test utils
am: 1a981d20fd

Change-Id: If2a2263c63a57ded638fcfa0ee407e716beba6fd
tree: 5eb2abfb9122bc1e38c983b8fb19c7892d821938
  1. build/
  2. common/
  3. tools/
  4. OWNERS
  5. PREUPLOAD.cfg
  6. test_defs.sh