[BenchTester] Remove trailing whitespace
[BenchTester] Add 'meta' column to benchtester_data and add_test_results

So data can now hold number:string pairs. This is going to be used on
AWSY to not have to have "Iteration 1/<huge datapoint>" and
"Iteration 2/<same huge datapoint>" cause 400% overhead in the
benchtester_datapoints table
[EnduranceTest] Update for new DB format