add in test for do_cube_transform in fv_grid_tool::init_grid

[bensonr]

Description

Re-introduces a fix from dev/gfdl that should be in master. This update changes an else to an elseif conditional around a call to cube_transform in fv_grid_tools::init_grid. This function is an option for generating a stretched grid internally. Without this conditional, all internally generated grids run through this function and will not match a grid generated externally.

Fixes # (issue) - no issue created

How Has This Been Tested?

This has been tested as part of the merge of master -> dev/gfdl.

Checklist:

Please check all whether they apply or not

• 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 made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[lharris4]

Looks good. This version of the cube rotation fixes the problem in which tile 6 was upside down. I am hoping that this can eventually be supported by the external tools (something that FV3lib would help with).

[lharris4]

Looks good. See my comment for my explanation of this new functionality.