Handle OSError better for get-from-cvp

[gmuloc]

reported from the field

           CRITICAL Uncaught Exception when running ANTA CLI       logger.py:116
                    Please reach out to the maintainer team or
                    open an issue on Github:
                    https://github.com/arista-netdevops-community/
                    anta.
                    PermissionError: [Errno 13] Permission denied:
                    'cvp_duts.yaml'