Use command line options intead of just argv values for training.

[sara-02]

It will be more efficient to use command line options instead of forcing user to submit 4 args or None.
If only one arg eg: training_url needs to be changed, then we either have make a change in the default value of the code or pass the new parameter along with other 4 unchanged ones.
File to be changed : Kronos_offline_training