Make recurisve permission updates optional

[andrewdnolan]

This PR makes recursively traversing the path provided (if it's a directory) optional.

Given the current automatic recursion, as part of unified deployments we see:

Updating file permissions for: /global/common/software/e3sm/anaconda_envs/test_e3sm_unified_1.12.0rc3_pm-cpu.csh                                                                          
Updating file permissions for: /global/common/software/e3sm/anaconda_envs/test_e3sm_unified_1.12.0rc3_pm-cpu.sh                                                                           
Updating file permissions for: /global/common/software/e3sm/anaconda_envs/e3smu_1_12_0rc3/pm-cpu   

Without the ability to toggle the recursion, we have no way to update the permissions for the:

 /global/common/software/e3sm/anaconda_envs/e3smu_1_12_0rc3

directory. We don't want to traverse that directory recursively, because some machines share a file system and there will be multiple machine entries within there. This allows us to update, without iterating over all the machine directories within there.

Checklist

• Testing comment, if appropriate, in the PR documents testing used to verify the changes

[xylar]

I agree, this makes sense.