Fix misuse of staging::file resources

The $target parameter was missing and so the files weren't actually
being created where I expected. Makes me wonder if these resources are
strictly needed, since I've been through a few runs with them broken. I
suspect however that I've been getting lucky and the pe-puppet service
has been starting before any of the other classes that need these ca
files present, and the agent requesting its cert fetches the necessary
credentials. Best to fix now and worry about whether or not an alternate
solution can be reached later.