Fix TestCmisBindingES.testQueryProxy on DBS Mem

java.lang.AssertionError: expected:<3> but was:<6>
	at org.junit.Assert.fail(Assert.java:88)
	at org.junit.Assert.failNotEquals(Assert.java:743)
	at org.junit.Assert.assertEquals(Assert.java:118)
	at org.junit.Assert.assertEquals(Assert.java:555)
	at org.junit.Assert.assertEquals(Assert.java:542)
	at org.nuxeo.ecm.core.opencmis.impl.TestCmisBinding.testQueryProxy(TestCmisBinding.java:3802)