Add basic storage roles to cloud files

for at and vagrant-vbox
Update array backend

to return an array for arrays that can't be found

Otherwise, the expression gets interpreted as ''
which can cause things that expect arrays to fail.
Do not randomly change journal size

Just fail. Randomly adjusting the passed in
journal size is extremely confusing and not
all that helpful.

It is better to just fail.
Update hiera for deployment use case