Enable flexible writing of restart file output time in UFS coupled configuration

[junwang-noaa]

Description

In the UFS coupled configuration, all the model components write out restart files with restart frequency, but in slightly different ways. It would be good to have a consistent way to enable the model components to write out restart files at flexible output time.

Solution

Alternatives

Related to

[dpsarmie]

The FV3_cap uses a -1 to specify an output forecast hour instead of an output frequency (fv3 code).

The option in the other submodules (using a -1 to designate this option) will be used to try and keep things consistent across all submodules.