Job log ends with rpc error

[jlewi]

I ran the demo in #32.

The logs from the job end with an rpc error

b'At step 1900, loss = 0.1070864349603653'
b'rpc error: code = Unknown desc = Error: No such container: 6a5c382f4a57c40c484d3cd0a7643b58c2219fe5ecaaed66d4e32a1e70012e74'

I believe this error is to be expected because the container will be deleted when the job finishes and if we are tailing the logs the tail will end with an error.

Assuming thats accurate, this behavior will undoubtedly confuse some people.

So we should try to avoid surfacing that error if possible.

[r2d4]

/assign @r2d4