Update fwatchdog to 0.6.1 and correct help message for "action" option

[itscaro]

Motivation and Context

• I have raised an issue to propose this change (Update fwatchdog to 0.6.1 and update command help message #56)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have signed-off my commits with git commit -s
• I have added tests to cover my changes.
• All new and existing tests passed.

[alexellis]

Hi there thanks for the PR. I think the work @johnmccabe is doing may cross-over and cover this too.. can you check if the messages are reflected in his in-progress PR? #50

[alexellis]

Merged.