[Dovecot] doveadm user -f index

[Micah Anderson]

I've configured my mail_location to have a different location for
performance reasons so they aren't in the same location as the
mail_location.

The 'doveadm user -f home' is useful to find where a user's home
directory is for various scripting purposes, but I can't seem to find a
way to determine the location of the user's indexes. 

I can do something with the output of dovecot -a to find the
mail_location and then look for a configured INDEX, but then I don't
have a good way of translating the %d/%1n/%n type string formatters into
their values for a user.

thanks for any suggestions!
micah

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