pytest: more testing for local socket addresses.

In particular, the assert when `--addr=/sockname` is used, and that it
doesn't clean up on restart, requiring manual deletion of the socket.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

tests/test_misc.py

@@ -566,6 +566,7 @@ def test_io_logging(node_factory, executor):
     assert any(l['type'] == 'IO_IN' for l in peerlog)
 
 
+@pytest.mark.xfail(strict=True)
 def test_address(node_factory):
     if DEVELOPER:
         opts = {'dev-allow-localhost': None}
@@ -595,6 +596,16 @@ def test_address(node_factory):
     l2 = node_factory.get_node()
     l2.rpc.connect(l1.info['id'], l1.daemon.opts['bind-addr'])
 
+    # 'addr' with local socket works too.
+    l1.stop()
+    del l1.daemon.opts['bind-addr']
+    l1.daemon.opts['addr'] = os.path.join(l1.daemon.lightning_dir, "sock")
+    # start expects a port, so we open-code here.
+    l1.daemon.start()
+
+    l2 = node_factory.get_node()
+    l2.rpc.connect(l1.info['id'], l1.daemon.opts['addr'])
+
 
 def test_listconfigs(node_factory, bitcoind):
     l1 = node_factory.get_node()