histedit: don't cleanup nodes already disposed of If something else took care of these temporary nodes, we don't need to do anything about it. This less liberal usage of pruning through cleanup nodes will help us further cleanup on the road to explicitly tracks folds.

py3: avoid b'' output in test-hgweb-non-interactive.t I couldn't figure out how to get the list to print without b'' with pycompat.write(), without converted each element to str.

py3: convert print to a function call in a few tests I *think* this is the last of them.