Decide which options should be mkfs-time, mount-time, module load-time, and per-file

[stevenjswanson]

My thoughts:

• metadata_csum: mkfs-time
• data_csum: mkfs-time
• data_parity: mkfs-time
• wprotect: mount-time
• inplace_data_updates: mount-time, per-file

[Andiry]

Reasonable to me.