[LU-2923] Enforce the Imperative Recovery requirement of "suppress_pings"

• Type: Bug
• Resolution: Fixed
• Priority: Blocker
• Fix Version/s: Lustre 2.4.0
• Affects Version/s: Lustre 2.4.0
• Labels: LB
• Severity: 3
• Assignee: Li Wei (Inactive)
• Reporter: Li Wei (Inactive)

Description

To reduce the chance of "clients missing server recovery windows" when suppressing pings, we should consider these changes:

1. Check if IR is available and ready before declaring a client is capable of suppressing pings.
2. Force pings if the MGS is down.