refactor: make test more flexible

running the test on minimized environments (docker images) prints additional lines which fails the test.

Given me only want to ensure that formatting and content are correct we can use `in` instead of extact match

Author: king-11

tests/test_misc.py

@@ -1171,9 +1171,9 @@ def test_cli_multiline_help(node_factory):
                                    '--lightning-dir={}'
                                    .format(l1.daemon.lightning_dir),
                                    'help', 'helpme']).decode('utf-8')
-    assert out == ("helpme msat  \n"
-                   " This is a message which consumes multiple lines and thus should\n"
-                   " be well-formatted by lightning-cli help\n")
+    assert ("helpme msat  \n"
+            " This is a message which consumes multiple lines and thus should\n"
+            " be well-formatted by lightning-cli help\n" in out)
 
 
 def test_cli_commando(node_factory):