Although this only needs to be done once, it's ugly enough of a task
that it should have a script, and that script should be reviewed.
The script can be run locally on a machine without a hieradata and it
will create a local directory with all of the keys and none of the data.
It will also print out the total mapping and a report on which keys are
duplicated across hosts after group de-duplication is taken in to
account.
Change-Id: Id0af46abb8f4167bd91e95cd7a6cd2e35e5b0a94
3815c906d4