Add another concurrency test for DataChannelRereader#784

jabrena merged 1 commit intoev3dev-lang-java:sysfs_perf2ev3dev-lang-java/ev3dev-lang-java:sysfs_perf2from

JakubVanek:sysfs_perf2_racetestJakubVanek/eljcore-private-dev:sysfs_perf2_racetestCopy head branch name to clipboard