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/storage-rest-common.go

@@ -23,6 +23,7 @@ const (
 )
 
 const (
+	storageRESTMethodHealth               = "/health"
 	storageRESTMethodDiskInfo             = "/diskinfo"
 	storageRESTMethodCrawlAndGetDataUsage = "/crawlandgetdatausage"
 	storageRESTMethodMakeVol              = "/makevol"