[LU-6535] updating fsname and index wth different orders have problems

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.8.0
• Labels: patch
• Severity: 3
• Assignee: Emoly Liu
• Reporter: Wang Shilong (Inactive)

Description

Updating fsname with following command failed:
tunefs.lustre --fsname lustre --writeconf /dev/mgs

But using following command succeed:
tunefs.lustre --writeconf --fsname lustre /dev/mgs

IT turned out this is because of options parsing order,
but actually, we should let both two ways work, so fix is also simple to
do sanity check after we have parsed all options.