o Select only stable tests in 'scons test' target list
    o Create a new flaky-test scons target to fill in the remaining flaky tests
    o If any test is still found to be unstable, it should be moved to the flaky tests list
    o Going forward, work towards truncating the flaky tests list

Change-Id: I3fe4e6bccdb639386495b5652d6a14b9de24c889