clients: add dig

Change-Id: I78822e9d68b36973362f0790f3c2f6e676cc6b94
deploy: shell script to deploy or test

Change-Id: I290fa852179313fffb71d64a30312e92ed1ae861
tools: add ndns-demo

Change-Id: I250d7bf8a02ffec8aee3226bbf830bc3e9bbfa3f