Force checkpoints check from command line.

[ffgalindo]

When one runs the script expecting to see the Storage Stats on STDOUT, and the checkpoint according to the setup frequency has not been reached, then nothing is shown as the endpoint will be skipped. This could be solved by adding a function that populates this information from what is available on memcache, or by adding a switch that forces all checkpoints to be checked.

[ffgalindo]

Added -f/--force flag.