add tests to validate timeout overrides

[kotman12]

https://issues.apache.org/jira/browse/SOLR-XXXXX

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[mlbiscoc]

For asserting on Exceptions could we assertThrows instead? Then assert that it was a timeout after? I like that over asserting on a catch on all these tests and the ones you updated below. Kind of like this

Suggested change

	assertTrue(isTimeout(e));
	SolrServerException exception = assertThrows("Expected an exception but no expcetion thrown", SolrServerException.class, () -> {
	// Run your logic to throw an excpetion
	});
	assertTrue("Expected a timeout exception but got: " + exception.getMessage(), isTimeout(exception));

[dsmiley]

Agreed.