tests: Use explicit imports

test/functional/p2p_node_network_limited.py

@@ -8,10 +8,10 @@ Tests that a node configured with -prune=550 signals NODE_NETWORK_LIMITED correc
 and that it responds to getdata requests for blocks correctly:
     - send a block within 288 + 2 of the tip
     - disconnect peers who request blocks older than that."""
-from test_framework.messages import CInv, msg_getdata, msg_verack
-from test_framework.mininode import NODE_BLOOM, NODE_NETWORK_LIMITED, NODE_WITNESS, P2PInterface, wait_until, mininode_lock
+from test_framework.messages import CInv, msg_getdata, msg_verack, NODE_BLOOM, NODE_NETWORK_LIMITED, NODE_WITNESS
+from test_framework.mininode import P2PInterface, mininode_lock
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import assert_equal, disconnect_nodes, connect_nodes_bi, sync_blocks
+from test_framework.util import assert_equal, disconnect_nodes, connect_nodes_bi, sync_blocks, wait_until
 
 class P2PIgnoreInv(P2PInterface):
     firstAddrnServices = 0