* Making username password etc non mandatory as we use persistence connection.
Some documentation fine tuning also done.
* To update version which was tested against.
* Adding Bacon switch (NE0152T) to device rules
* Qalthos Review catch
* Updating version
* Changing documentation to add Bacon switch. This is effective since 2.8
* Refactoring code to adhere to persistence connection.
* Update cnos_rollback.py
* Updating license for the refactored method
* Update cnos_rollback.py
* Removing the BSD License as suggested by Legal
* Adding cnos_image after testing on sftp. Test code is also added
* Removing debug comments
* adding space