[qa] mininode: Expose connection state through is_connected

test/functional/p2p_compactblocks.py

@@ -87,7 +87,7 @@ class TestP2PConn(P2PInterface):
         This is used when we want to send a message into the node that we expect
         will get us disconnected, eg an invalid block."""
         self.send_message(message)
-        wait_until(lambda: self.state != "connected", timeout=timeout, lock=mininode_lock)
+        wait_until(lambda: not self.is_connected, timeout=timeout, lock=mininode_lock)
 
 class CompactBlocksTest(BitcoinTestFramework):
     def set_test_params(self):