tests: Use explicit imports

test/functional/p2p_unrequested_blocks.py

@@ -51,11 +51,13 @@ Node1 is unused in tests 3-7:
    work on its chain).
 """
 
-from test_framework.mininode import *
-from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import *
 import time
+
 from test_framework.blocktools import create_block, create_coinbase, create_tx_with_script
+from test_framework.messages import CBlockHeader, CInv, msg_block, msg_headers, msg_inv
+from test_framework.mininode import mininode_lock, P2PInterface
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import assert_equal, assert_raises_rpc_error, connect_nodes, sync_blocks
 
 
 class AcceptBlockTest(BitcoinTestFramework):