tree c99b7e91e3ef222ed123868927e7ab3facbeadce
parent ad01d7aa34963e61dbbae6e055867e0efe27e7ee
author Adam Sadovsky <asadovsky@gmail.com> 1456454811 -0800
committer Adam Sadovsky <asadovsky@gmail.com> 1456454811 -0800

lib: gosh: switch from Logf/Fatalf to TB, and related

This change makes most of the changes described in the final
proposal in https://v.io/i/1128 - namely, it makes all the
requisite API changes.

Things not done in this change:
- "Good PC" logging
- Printing Cmd stdout/stderr on failure

Those will be done in subsequent changes.

MultiPart: 4/9

Change-Id: I04b0fa0af8aa358a42db055a9c8503ffa4e88904