test_logdevice.rb: use assert_in_out_err

* test/logger/test_logdevice.rb (test_shifting_midnight): use
  verbose assert_in_out_err instead of assert_ruby_status.

* test/logger/test_logdevice.rb (test_shifting_dst_change): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45094 b2dd03c8-39d4-4d8f-98ff-823fe69b080e