chainsaw-update: log actual locks breaking
Previously, the command would simply state that it was about
to break locks, not if there was actually some to break.
This version is race-free. It would be also possible to display
the content of the lock before hand (not race-free but informative
in almost all cases).
#require docutils gettext
$ $TESTDIR/check-gendoc zh_CN
checking for parse errors