Investigate using gcsfuse for tools

[mbookman]

Preliminary use of the gcsfuse adapter indicates that it is quite good for operations that make a single read pass over a file. The PD used for local cache does not need to be as big as the file to be downloaded.

The potential down-side here is performance. If the temp dir is on a small disk, then performance may suffer. If however the temp dir were on a ramdisk, then this could be extremely fast (and reduce costs).