tree fed4b99b1414816f5a8ec5dcd0e8072a05f5c9ff
parent af684312889b275b9e2956e8147f49fd84ae9acb
author You Wang <you@onlab.us> 1453941153 -0800
committer You Wang <you@onlab.us> 1453941153 -0800

Improve host discovery (IPv6) and link events verification methods in CHO test

- Add a less stressful ping method to replace IPv6 pingall when
  discovering hosts
- Add retries when verifying link down/up events
- Fix some typos

Change-Id: I25f974b9b7c490282b4a822e5fddc7e167bb75a0