LU-16483 ptlrpc: Track highest reply XID

LU-16483 ptlrpc: Track highest reply XID

Keep track of the highest XID that we've received a reply for.
When an OBD_PING expires, do not disconnect the import if the failed
XID is less than or equal to the last reply XID. This avoids situation
where a lost OBD_PING rpc causes a reconnect even though we've
completed other RPCs in the meantime.

HPE-bug-id: LUS-11474
Signed-off-by: Chris Horn <chris.horn@hpe.com>
Change-Id: I7e66bcc1368fa41ec86ffd843abac676f8d29254
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/49807
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>