Test: Fix example_test.py

Author: jtimon

test/functional/example_test.py

@@ -15,8 +15,10 @@
 
 # Avoid wildcard * imports if possible
 from test_framework.blocktools import (create_block, create_coinbase)
-from test_framework.mininode import (
+from test_framework.messages import (
     CInv,
+)
+from test_framework.mininode import (
     P2PInterface,
     mininode_lock,
     msg_block,