Add a Different TestTerminatedState when Aborted in START or READY State

[VincenzoFerme]

We currently have:

testModelDAO.setTestState(testID, BenchFlowTestState.TERMINATED);
testModelDAO.setTestTerminatedState(testID, TestTerminatedState.PARTIALLY_COMPLETE);

for all che case in the cancelTask method. We should define a different TestTerminatedState when the termination happens in the START and READY state because the test has not been started, so cannot be PARTIALLY_COMPLETE. (see also #474 (comment))

[VincenzoFerme]

Remember last completed executed state for restarting after abort