[LU-13735] Loosen restrictions on LNet Health parameter settings

• Type: Improvement
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.14.0
• Assignee: Chris Horn
• Reporter: Chris Horn

Description

The functions that set various LNet Health related parameters require
that the parameters be set in a specific order depending on whether
health is enabled or disabled. This is not user-friendly.

• Don't overwrite lnet_transaction_timeout when health is being
  enabled or disabled.
• Don't overwrite lnet_retry_count when health is being enabled
  (still set it to zero when health is disabled).
• Allow lnet_retry_count to be set to 0 when health is disabled
• Correct off-by-one error in transaction_to_set() to ensure
  lnet_transaction_timeout is greater than lnet_retry_count