testLocalRenameLanguageKeyword (org.eclipse.cdt.ui.tests.quickfix.AssistQuickFixTest) flaky

The flaky test

`testLocalRenameLanguageKeyword (org.eclipse.cdt.ui.tests.quickfix.AssistQuickFixTest)`

with this output:

```
Reconciler did not finish in time
junit.framework.AssertionFailedError: Reconciler did not finish in time
	at org.eclipse.cdt.ui.tests.quickfix.AssistQuickFixTest.setUp(AssistQuickFixTest.java:119)
```


