Remove unused module from rpc-tests

qa/rpc-tests/rpcnamedargs.py

@@ -3,17 +3,11 @@
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-from decimal import Decimal
-
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.authproxy import JSONRPCException
 from test_framework.util import (
     assert_equal,
     assert_raises_jsonrpc,
-    assert_is_hex_string,
-    assert_is_hash_string,
     start_nodes,
-    connect_nodes_bi,
 )