__discover_jmeter_udp_port fix process_stderr file is searched for port number
__discover_jmeter_udp_port fix
process_stderr file is searched for port number

pattern for searching is unified to be acceptable for both 2.13 and 3.0 jmeter versions

yandex/yandex-tank,f2nd/yandex-tank,nettorta/yandex-tank,netortik/yandex-tank,f2nd/yandex-tank,fomars/yandex-tank,fomars/yandex-tank,netortik/yandex-tank,yandex/yandex-tank,nettorta/yandex-tank