Update cori_atmnbfb testing to use new e3sm_simple environment

Mametjanov, Azamatrequested to merge
github/fork/jhkennedy/update-atmnbfb into master

Created by: jhkennedy

The climate reproducibility tests being run in the cori_atmnbfb test suite are being refactored in [Forthcoming CIME PR] to use the EVV conda package, which is installed in the new e3sm_simple conda environment. This updates the cori_atmnbfb jenkins job to use e3sm_simple.

I also updated the README a bit to use more of the available code markdown syntax.

Still TODO

This is marked as a WIP because these things are required first:

  • Deploy e3sm_simple to cori-knl; follow progress at E3SM-Project/e3sm-unified#53
  • E3SM-Project/E3SM#3135 merged into E3SM

Note: The current version of the PGN test being run in the cori_atmnbfb test suite requires the Scikit Learn conda package but the refactored PGN will not need it (same things accomplished in numpy). So:

  • The current PGN test will break in the e3sm_simple environment because of the missing scikit-learn package
  • The refactored PGN and TSC test will break in the python/2.7-anaconda-5.2 environment currently used on cori-knl because of the missing evv4esm package.

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