Add a custom healthcheck function for online status (#9858)

- Add changes to ensure remote disks are not
  incorrectly taken online if their order has
  changed or are incorrect disks.
- Bring changes to peer to detect disconnection
  with separate Health handler, to avoid a
  rather expensive call GetLocakDiskIDs()
- Follow up on the same changes for Lockers
  as well

cmd/lock-rest-server-common.go

@@ -27,6 +27,7 @@ const (
 )
 
 const (
+	lockRESTMethodHealth  = "/health"
 	lockRESTMethodLock    = "/lock"
 	lockRESTMethodRLock   = "/rlock"
 	lockRESTMethodUnlock  = "/unlock"