tunnel: Switch streams to use union

With this change, the tunnel API now uses union instead of struct for
the client and server stream. Only one of the fields is ever used at a
time. So, this is a very good fit for union.

Change-Id: I04bb8834132ab728ce997973775548682de2abf1
6 files changed
tree: 73a48963adf6c62bf566a9d9741866af0237410f
  1. rps/
  2. tunnel/
  3. .gitignore