Trogdor workloads fail because topics are not fully created when workloads start.

In many instances, when running with high partition counts, trogdor ProduceBench workloads have been failing with the following error:

This server does not host this topic-partition. 

This is caused by the test not checking that the topic is fully created before starting to produce to it.

As far as I see it, there are 2 options here:

1. Check the topic status at the beginning of the test and wait for the topic to be in a healthy state.
2. Add exception handling around the SendRecords call to allow for ignoring these failures and continuing.

#2 would be easier than #1, however they both have trade-offs.