pyln-testing: restore proper streaming behaviour for lightningd.

Get it to log direct to stdout, so we see what's happening *as it
happens* rather than as we read it.  We could restore the thread we
were using before, but that added more problems than it solved.

This means that we need the hsm password prompts in the log though.

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

tests/test_misc.py

@@ -1007,8 +1007,11 @@ def test_daemon_option(node_factory):
     l1.stop()
 
     os.unlink(l1.rpc.socket_path)
+    # Stop it from logging to stdout!
     logfname = os.path.join(l1.daemon.lightning_dir, TEST_NETWORK, "log-daemon")
-    subprocess.run(l1.daemon.cmd_line + ['--daemon', '--log-file={}'.format(logfname)], env=l1.daemon.env,
+    l1.daemon.opts['log-file'] = logfname
+    l1.daemon.opts['daemon'] = None
+    subprocess.run(l1.daemon.cmd_line, env=l1.daemon.env,
                    check=True)
 
     # Test some known output (wait for rpc to be ready)
@@ -2399,7 +2402,10 @@ def test_version_reexec(node_factory, bitcoind):
 
 
 def test_notimestamp_logging(node_factory):
-    l1 = node_factory.get_node(options={'log-timestamps': False})
+    l1 = node_factory.get_node(start=False)
+    # Make sure this is specified *before* other options!
+    l1.daemon.early_opts = ['--log-timestamps=false']
+    l1.start()
     assert l1.daemon.logs[0].startswith("DEBUG")
 
     assert l1.rpc.listconfigs()['log-timestamps'] is False