tests/test-lock-badness.t

tests: run check-code with warnings and maintain a whitelist

check-code has fine warning checks, but they are a bit noisy and nobody used
them.

Now the warnings will be run in the test suite, where a list of accepted
warnings will be maintained.

Those who introduce or touch a line with a warning will now have to update the
whitelist ... or fix the warning.

  $ "$TESTDIR/hghave" unix-permissions || exit 80

  $ hg init a
  $ echo a > a/a
  $ hg -R a ci -A -m a
  adding a

  $ hg clone a b
  updating to branch default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ echo b > b/b
  $ hg -R b ci -A -m b
  adding b

  $ chmod 100 a/.hg/store

  $ hg -R b push a
  pushing to a
  abort: could not lock repository a: Permission denied
  [255]

  $ chmod 700 a/.hg/store