fixing some unquoted values, particularly the file mode

I believe that puppet 3.7 gets fairly upset with unquoted values (and I came across this when updating our codebase for a puppet 3.7 master). I've quoted some values here which were not quoted, and made the the file mode a string as recommended at https://docs.puppetlabs.com/references/latest/type.html#file-attribute-mode. Those docs are referencing the file type, but I assume the same should apply to the concat type.

Cheers!