py3: explicitly convert a list to bytes to pass in ui.debug
Here pats is a list obviously. Since we can't pass unicodes to ui.debug, we
have to pass this as bytes.
Jun Wu <quark@fb.com> [Wed, 17 May 2017 20:14:27 -0700] rev 32347
changelog: make sure datafile is 00changelog.d (API)
0ad0d26ff7 makes it possible for changelog datafile to be "00changelog.i.d",
which is wrong. This patch adds an explicit datafile parameter to fix it.