[zanata/zanata-scripts] c52f7b: Use checkout, env.JENKINS_HOME

[GitHub]

  Branch: refs/heads/ZNTA-1803-maven-release-pipeline
  Home:   https://github.com/zanata/zanata-scripts
  Commit: c52f7b1a1bae75b51942e636a8298025ac5e450e
      https://github.com/zanata/zanata-scripts/commit/c52f7b1a1bae75b51942e636a8298025ac5e450e
  Author: Ding-Yi Chen <dchen at redhat.com>
  Date:   2018-02-16 (Fri, 16 Feb 2018)

  Changed paths:
    M jenkins/maven-Jenkinsfile

  Log Message:
  -----------
  Use checkout, env.JENKINS_HOME