Add kessler_test Test SDF for FPHYStest to split off from FKESSLER test

[jimmielin]

Originator(s): jimmielin

Description (include issue title and the keyword ['closes', 'fixes', 'resolves'] and issue number):

The FPHYStest test for Kessler in SIMA right now uses the same suite_kessler.xml as FKESSLER, which means it includes physics_after_coupler and other check_energy schemes we do not want to include in the FPHYStest test which should only be testing kessler_tend.

This PR includes a new suite_kessler_test.xml that removes all the other schemes from the SDF and keeps only what we want to test, and consistent with how the snapshots are taken in CAM:

      if (trim(cam_take_snapshot_before) == "kessler_tend") then
         call cam_snapshot_all_outfld(cam_snapshot_before_num, state, tend, cam_in, cam_out, pbuf)
      end if

      call kessler_tend(state, ptend, ztodt, pbuf)
      if ( (trim(cam_take_snapshot_after) == "kessler_tend") .and.            &
           (trim(cam_take_snapshot_before) == trim(cam_take_snapshot_after))) then
         call cam_snapshot_ptend_outfld(ptend, lchnk)
      end if
      call physics_update(state, ptend, ztodt, tend)

      if (trim(cam_take_snapshot_after) == "kessler_tend") then
         call cam_snapshot_all_outfld(cam_snapshot_after_num, state, tend, cam_in, cam_out, pbuf)
      end if

List all namelist files that were added or changed: N/A

List all files eliminated and why: N/A

List all files added and what they do:

A       test/test_suites/suite_kessler_test.xml
  - new kessler_test suite

List all existing files that have been modified, and describe the changes:
(Helpful git command: git diff --name-status development...<your_branch_name>)
N/A

List all automated tests that failed, as well as an explanation for why they weren't fixed:
N/A

Is this an answer-changing PR? If so, is it a new physics package, algorithm change, tuning change, etc?
Yes for FPHYStest kessler test

If yes to the above question, describe how this code was validated with the new/modified features:
BFB when using this suite

[nusbaume]

Thanks @jimmielin!

[peverwhee]

:)