Fixes the nersc testing issue for the run_e3sm test script

Mametjanov, Azamatrequested to merge
mfdeakin-sandia/nersc-rune3sm-fixes into master

Created by: mfdeakin-sandia

Also makes the common setup more generic regarding the E3SM repository name, and updates the test script names to e3sm instead of acme. I tested this by running the script on cori-knl; the case finished and was reported successfully.

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