Build User Vars Plugin：（提供一些Jenkins JOB Build的环境变量，参照：https://wiki.jenkins-ci.org/display/JENKINS/Build+User+Vars+Plugin）
BUILD_USER – full name of user started build,
BUILD_USER_FIRST_NAME – first name of user started build,
BUILD_USER_LAST_NAME – last name of user started build,
BUILD_USER_ID – id of user started build
