ssh: ssh_test_lib add extra remove_handler to improve robustness in tests

Author: u3s

lib/ssh/test/ssh_test_lib.erl

@@ -1344,6 +1344,7 @@ set_log_level(Level) ->
     ok = logger:set_primary_config(level, Level).
 
 add_log_handler() ->
+    logger:remove_handler(?MODULE),
     TestRef = make_ref(),
     ok = logger:add_handler(?MODULE, ?MODULE,
                             #{level => debug,