Use several partitions in functional client tests

This is more realistic than testing with a single partition, in particular when
there are more storage nodes that copies.

neo/tests/functional/testClient.py

@@ -70,6 +70,7 @@ class ClientTests(NEOFunctionalTest):
         NEOFunctionalTest.setUp(self)
         self.neo = NEOCluster(
             ['test_neo1', 'test_neo2', 'test_neo3', 'test_neo4'],
+            partitions=3,
             replicas=2,
             master_count=1,
             temp_dir=self.getTempDirectory()