Move some methods away from AbstractConnectionManagerTestCase

public void testIdleTimeout() throws Exception
public void testPartialIdleTimeout() throws Exception
public void testFillToMin() throws Exception
public void testPrefillPool() throws Exception
public void testNonStrictMinPool() throws Exception
public void testStrictMinPool() throws Exception
public void testMisConfiguredFillToMin() throws Exception
public void testChangedMaximum() throws Exception
public void testAllocationRetry() throws Exception
public void testAllocationRetryMultiThread() throws Exception

Must be moved in another test case covering pool config an behaviors. These methods are not yet implemented in AbstractConnectionManagerTestCase and need to be implemented too.