Revert "Implement IAM propagation to S3 servers (#8130)"

This reverts commit 551a31e156.

weed/server/filer_server.go

@@ -256,10 +256,6 @@ func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption)
 
 	fs.filer.Dlm.LockRing.SetTakeSnapshotCallback(fs.OnDlmChangeSnapshot)
 
-	if fs.CredentialManager != nil {
-		fs.CredentialManager.SetMasterClient(fs.filer.MasterClient, fs.grpcDialOption)
-	}
-
 	return fs, nil
 }