[LU-11514] LNet Health: Cleanup NI states to make code more readable

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.12.0
• Labels: lnet-health
• Severity: 3
• Assignee: Amir Shehata (Inactive)
• Reporter: Amir Shehata (Inactive)

Description

Currently the NI state is a bit mask to accommodate recovery flags. Make recovery flags a separate field in the ni structure and make the states an enumeration.