[FEATURE REQUEST] salt-cloud does not support using using salt file server for file_map

[ggiesen]

Is your feature request related to a problem? Please describe.
I started using the file_map feature of salt-cloud (on vmware specifically) and it appears it does not support using the salt file server as the file source (ie salt://scripts/some_script.sh). This means I have to use yet another mechanism to do version control/CI/CD for these types of scripts, instead of using gitfs.

This works:

file_map:
  /srv/scripts/some_script.sh: /root/some_script.sh

This does not:

file_map:
  salt://scripts/some_script.sh: /root/some_script.sh

Describe the solution you'd like
Add support for salt file server script sources for file_map in salt-cloud

Describe alternatives you've considered
Use local files with a separate synchronization mechanism (apart from salt's gitfs)

[ggiesen]

I would love to see this apply more broadly to any code that is executed by the master (reactor scripts, etc). It would be nice if the master had access to the salt:// filesystem just as the minions do.