isServerResolvable its sufficient to check server is reachable (#11609)

using isServerResolvable for expiration can lead to chicken
and egg problems, a lock might expire knowingly when server
is booting up causing perpetual locks getting expired.

cmd/prepare-storage.go

@@ -205,14 +205,6 @@ func isServerResolvable(endpoint Endpoint, timeout time.Duration) error {
 	}
 	xhttp.DrainBody(resp.Body)
 
-	if resp.StatusCode != http.StatusOK {
-		return StorageErr(resp.Status)
-	}
-
-	if resp.Header.Get(xhttp.MinIOServerStatus) == unavailable {
-		return StorageErr(unavailable)
-	}
-
 	return nil
 }