Enable traditional threading as an option

[aerorahul]

Description

In a previous PR, stubs were added to enable traditional threading in the UFS.
This PR takes the next step to execute the model with traditional threading.
Specifically;

1. Do not use the _esmf ufs_configure file for traditional threading. This sets the globalResourceControl to false (traditional threading) ... this was done in the previous PR
2. when calculating components pet bounds do not multiply with number of threads also in ufs_configure ... this PR
3. export OMP_NUM_THREADS=$UFS_THREADS ... this was done in the previous PR

The default behaviour to use ESMF-managed threading is retained. Traditional threading can be achieved by toggling USE_ESMF_THREADING flag in config.fcst

Closes #3122 - as in allows the model to be configured to run w/ traditional threading. Testing on C768 S2SW was successful on Hercules (This was previously reported to be failing)

The use of traditional threading will be inefficient for model components that are not thread-enabled and supported e.g. MOM6 and CICE6, but since they require smaller number of tasks compared to ATM or WAV, the CPU 'waste' is not huge.

Type of change

• Bug fix (fixes something broken)
• New feature (adds functionality)
• Maintenance (code refactor, clean-up, new CI test, etc.)

Change characteristics

• Is this a breaking change (a change in existing functionality)? NO
• Does this change require a documentation update? NO
• Does this change require an update to any of the following submodules? NO (If YES, please add a link to any PRs that are pending.)
  • EMC verif-global
  • GDAS
  • GFS-utils
  • GSI
  • GSI-monitor
  • GSI-utils
  • UFS-utils
  • UFS-weather-model
  • wxflow

How has this been tested?

Testing on Hercules for a C768 S2SW case was run with traditional threading (4 threads)
Some particulars of the run are as follows:
Run directory: /work/noaa/stmp/rmahajan/HERCULES/RUNDIRS/c768s2swtt/gfs.2019120300/gfsfcst.2019120300/fcst.2077795/
Run log: /work2/noaa/stmp/rmahajan/RUNTESTS//COMROOT/c768s2swtt/logs/2019120300/gfs_fcst_seg0.log

Checklist

• Any dependent changes have been merged and published
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have documented my code, including function, input, and output descriptions
• My changes generate no new warnings
• New and existing tests pass with my changes
• This change is covered by an existing CI test or a new one has been added
• Any new scripts have been added to the .github/CODEOWNERS file with owners
• I have made corresponding changes to the system documentation if necessary

[aerorahul]

After some waiting for WW3 points, it seems the model progressed in the test on Hercules. The run will time out at 30 mins, because I was testing it. Still worth taking a look at the log.

[aerorahul]

A run of the test C768_S2SW succeeded on Hercules with traditional threading.
This test was previously reported to be failing on Hercules and Orion.
I have not tested this for C1152 or Orion.