function to return file on host

function to return a file (file_path/file_name) on a specified host for
a specific (type, id). this can be used to find binaries and inputs on
any host.

if hostname == localhost it will use the fqdn to search the database.
check inputs specified

this will check to make sure required inputs are specified for model
if input is an id, it will replace it with the path on the host where
the model will run.