tests: Use explicit imports

test/functional/rpc_scantxoutset.py

@@ -4,8 +4,9 @@
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Test the scantxoutset rpc call."""
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import *
+from test_framework.util import assert_equal
 
+from decimal import Decimal
 import shutil
 import os