tests: filter out uninteresting log events
Core has new ui.log() calls added (for tracking extension loading and
performance, for example), but in test-discovery-obshashrange.t it produces a
bunch of lines that are unrelated to the test. So we filter them out to not
touch test output. This is inspired by 1de3364320af in core.
#require test-repo pyflakes
Copied from Mercurial core (60ee2593a270)
$ cd "`dirname "$TESTDIR"`"
run pyflakes on all tracked files ending in .py or without a file ending
(skipping binary file random-seed)
$ hg locate 'set:(**.py or grep("^#!.*python")) - removed()' 2>/dev/null \
> | xargs pyflakes 2>/dev/null