jenkins 的 ProcessTreeKiller----无法启动子进程的解决办法

参考：

http://alanland.iteye.com/blog/2047244

http://scmbob.org/start-process-in-jenkins.html

java -Dhudson.util.ProcessTree.disable=true -jar jenkins.war  

BUILD_ID=dontKillMe /usr/apache/bin/httpd