cpld_2threads test does not reproduce for fractional grid

[DeniseWorthen]

Description

The cpld_2threads test compares against the cpld_control. In non-frac grid mode, the cpld_2thread test passes. In frac-grid mode, it fails.

To Reproduce:

Tested on gaea.intel. Switch both cpld_control and cpld_2threads to the fractional grid. The answers are not B4B.

Additional context

Found during testing for PR #584

Output

The following fields do not reproduce after the first timestep of the ATM in frac_grid mode:

 RMS atmImp_Faxa_lat                  2.9457E-13            NORMALIZED  2.2547E-46
 RMS atmImp_Faxa_lwdn                 4.8168E+00            NORMALIZED  1.7943E-02
 RMS atmImp_Faxa_lwnet                4.6960E+00            NORMALIZED  9.2715E-02
 RMS atmImp_Faxa_rain                 1.3645E-06            NORMALIZED  4.5754E-02
 RMS atmImp_Faxa_sen                  9.4012E-12            NORMALIZED  7.1958E-45
 RMS atmImp_Faxa_snow                 5.8100E-07            NORMALIZED  3.3413E-02
 RMS atmImp_Faxa_swndf                5.9760E-02            NORMALIZED  1.4773E-03
 RMS atmImp_Faxa_swvdf                1.1764E-01            NORMALIZED  2.3500E-03
 RMS atmImp_Faxa_taux                 2.5775E-07            NORMALIZED  1.9728E-40
 RMS atmImp_Faxa_tauy                 1.7331E-07            NORMALIZED  1.3266E-40
 RMS atmImp_Sa_pbot                   1.3248E-02            NORMALIZED  1.3686E-07
 RMS atmImp_Sa_shum                   4.1865E-06            NORMALIZED  1.1613E-03
 RMS atmImp_Sa_tbot                   1.1647E-01            NORMALIZED  4.2906E-04
 RMS atmImp_Sa_z

[DeniseWorthen]

Testing against the current top of develop shows that the cpld_2threads passes on Jet, Cheyenne. On Hera, Gaea and Orion it still fails.