Ignacio R. Morelle d0d95f2f9f wam: Use a tuple for the --change-passphrase argument's metavar
Fixes its help entry looking like this:

>  --change-passphrase ADD-ON OLD NEW ADD-ON OLD NEW ADD-ON OLD NEW
>                        Change the passphrase for ADD-ON from OLD to NEW

When it really should look like this:

>  --change-passphrase ADD-ON OLD NEW
>                        Change the passphrase for ADD-ON from OLD to NEW
2014-06-12 00:27:20 -04:00
..
2014-06-10 06:10:03 -04:00
2014-05-12 11:43:55 -04:00