Added reason to 418 error code
Merge branch 'master' of https://github.com/yandex-load/yandex-tank-api
Merge branch 'master' of https://github.com/yandex-load/yandex-tank-api
Merge branch 'master' of https://github.com/yandex-load/yandex-tank-api
Merge branch 'master' of https://github.com/yandex-load/yandex-tank-api
Merge branch 'master' of https://github.com/yandex-load/yandex-tank-api
Merge branch 'master' of https://github.com/yandex-load/yandex-tank-api
Merge branch 'master' of https://github.com/yandex-load/yandex-tank-api
Fixed KeyboardInterrupt handling on test start
Reverted poll stage; fixed KeyboardInterrupt at unlock stage