Add intel snapshot testing

[peverwhee]

What is the feature/what would you like to discuss?

We currently only have GNU snapshots for our snapshot testing (null dycore, 2 timestep tests).

Eventually, we want to have intel tests as well, which will mean:

1. generating intel snapshots for each of the schemes we're testing (using the code mods in https://github.com/NCAR/CAM-SIMA_backups)
2. Creating new test cases that point to the intel snapshots
3. Adding tests to testlist_cam.xml

Is there anyone in particular you want to be part of this conversation?

No response

Will this change (regression test) answers?

No

Will you be implementing this enhancement yourself?

Any Software Engineer can do this

[peverwhee]

@cacraigucar has added intel snapshots for ZM so there's a start!