tree e6adb00c0038525746e2f12bec31502f66caf728
parent 64fc198a1b45653113b0a9eed380cfc7c703d88a
author Adam Sadovsky <asadovsky@gmail.com> 1456445890 -0800
committer Adam Sadovsky <asadovsky@gmail.com> 1456445890 -0800

playground: 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: 8/9

Change-Id: I043f7ee0cc482d6bfd3ec93293bc1e3f9a9242f0