Improve how we execute load tests

[mutambaraf]

We are currently planning to execute different jobs in the cluster and the current set up requires editing run-cluster.sh which have all the configs for starting the test. We should find away to make this more convenient and scalable as we add more .

1. One solution is to introduce a separate pod that we are able to interact with to start a specific test.
2. Second option is to split the file and add a separate file for each test .Possibly have a base config that has common configs that we can share across the different test.