test: also use 'devel.legacy.exchange=bundle1' in test Changeset 39537bc64442 in mercurial removed the 'experimental.bundle2' option. We use the new option in parallel.

dirstate: use arg count for version check In 52ff07e1de91 in the main hg repo, dirstate was changed to require a second argument, making the default args check no longer work. Instead, we switch to check the number of arguments, which should be backwards and forwards compatible.