Add the BaseLine load test to the Jenkins pipeline

This is a first step of connecting of automated load tests to prject CI pipline.

Specific actions to take:

1. Add to the load-tests subproject a command line option that will allow to choice which load test plan(s) to run: Baseline, main Test Plan or all present in the tests catalog (that is a current behavior).
2. Configure existing JC. Run Load tests job to run only the BaseLine load test plan.
3. Tune the Threshold setting of the JC. Run Load tests job to mark the job result as Unstable if considerable problems appear during test.
4. Call JC. Run Load tests job from the JC. To Performance pipline job to perform Baseline load tests as a part of pipeline.