Ignore Network Errors in Sequential Test

[korthout]

There was a QA run failure due to the sequential test: slack

Only 9 out of 10 instances of the sequential test process were run

In the logs we saw:

Exception in iteration 3:Network closed for unknown reason caused by io.grpc.StatusRuntimeException: UNAVAILABLE: Network closed for unknown reason

This error was not handled gracefully in the SequentialTestDriver

Since the network is unreliable, we can ignore this error and retry the step.

We can ignore it here.