CLI/Clush: Use the program name in OutputHandlers and RunTimer

[mattaezell]

Also allow manually-instantiated OutputHandlers to specify an alternate program
name.

Closes #433

Signed-off-by: Matt Ezell [email protected]

[mattaezell]

I debated whether or not to manually specify prog='clush' in the clush invocation of the output handlers or let it use sys.argv[0] by default. People using the command as clush3 will now see clush3 in their error messages (the unit tests don't change because they specify argv manually).

I also didn't add a specific test for this change, as the tests really don't belong in CLIClush.py. But happy to look into adding one if you have any guidance.

[degremont]

Overall looks ok to me. If we decide to move these Handlers to a dedicated package, that's fine as we will have to import all of them here except for OutputHandler so we are probably good for compat.

[mattaezell]

@thiell mind taking a look at this one? Thanks.

[thiell]

Looks good, thanks!