Add SDF and associated changes for using nTiedtke deep convective scheme

[grantfirl]

• add new SDF based on SCM_GFS_v15p2 that exercises the nTiedtke deep convection scheme, based on the FV3_GFS_2017_ntiedtke suite in the "unused" suite directory of fv3atm
• add physics namelist consistent with new SCM_GFS_v15p2 suite
• add default configuration for new suite in suite_info.py
• add new suite to RT setup
• add back suite object in run_scm.py; it was removed a while ago, but this breaks the ability to run a single, unsupported suite/case

[matusmartini]

@grantfirl Thank you for adding this suite. Are you waiting for this to be merged first and then proceed with NCAR/ccpp-physics#1025

[grantfirl]

@grantfirl Thank you for adding this suite. Are you waiting for this to be merged first and then proceed with NCAR/ccpp-physics#1025

@matusmartini No, I'm waiting for a review approval. @dustinswales @mkavulich @scrasmussen @hertneky

[grantfirl]

Once there is an approval, I'll merge NCAR/ccpp-physics#1025 first, then this.

[grantfirl]

@scrasmussen @mkavulich @hertneky RTs pass with the exception of missing baselines for the new test for the new suite, as expected. Once approved/merged, please update the baselines on mohawk.

[hertneky]

Looks good to me