create test and worker summary report

a summary report that includes counts of the test results so far
as well as a worker report to let us understand how our workers
are balanced at the moment, as well as if we are missing worker
0 in our data (which seems to happen quite often).

Change-Id: Ide0b63b86e87f8a18c2f0e45264692ac3797c791
Merge "create test and worker summary report"