tests: Use explicit imports

test/functional/feature_fee_estimation.py

@@ -6,7 +6,7 @@
 from decimal import Decimal
 import random
 
-from test_framework.mininode import CTransaction, CTxIn, CTxOut, COutPoint, ToHex, COIN
+from test_framework.messages import CTransaction, CTxIn, CTxOut, COutPoint, ToHex, COIN
 from test_framework.script import CScript, OP_1, OP_DROP, OP_2, OP_HASH160, OP_EQUAL, hash160, OP_TRUE
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (