Few suggested changes/corrections

[ghost]

1- Instructions in README.md and Jupyter Notebooks. The aws configure command is only required to set the region. Adding the credentials will override the temporary credentials from the role attached to the EC2 instance.

2- In the Cloudformation the default value for the KeyName should be removed.

3- In the Jupyter Notebook, "Notebook Parameter" the string "PLEASE ENTER YOUR DEVICE ID" may confuse the user to enter the device ID there (replacing the text) instead of the previous line.

4- Instructions in the README.md. It would be nice to note that this test utils will require a correct device id for the deployment part. So for customer who does not own a device can try all cells before the deployment cell by using any fake device id.

[shimomut]

These are all great/useful feedback. Thank you Mohsen.
Let us discuss how to improve these points.