Implement `-k` `--reset-timestamp` CLI flag

[BriocheBerlin]

trafficstars

From sudo man page:

When used without a command, invalidates the user's cached credentials. In other words, the next time sudo is run a password will be required. This option does not require a password, and was added to allow a user to revoke sudo permissions from a .logout file.
When used in conjunction with a command or an option that may require a password, this option will cause sudo to ignore the user's cached credentials. As a result, sudo will prompt for a password (if one is required by the security policy) and will not update the user's cached credentials.

Not all security policies support credential caching.