tests: Use explicit imports

test/functional/p2p_fingerprint.py

@@ -11,18 +11,18 @@ the node should pretend that it does not have it to avoid fingerprinting.
 import time
 
 from test_framework.blocktools import (create_block, create_coinbase)
+from test_framework.messages import CInv
 from test_framework.mininode import (
-    CInv,
     P2PInterface,
     msg_headers,
     msg_block,
     msg_getdata,
     msg_getheaders,
-    wait_until,
 )
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
     assert_equal,
+    wait_until,
 )
 
 class P2PFingerprintTest(BitcoinTestFramework):