deploy jenkins plugin pom.xml file.

This is a fix for bug 1208901.

  *modules/openstack_project/files/jenkins_job_builder/config/jenkins-plugin-jobs.yaml
     - move more details into jenkinsci-upload.sh

  *modules/jenkins/files/slave_scripts/maven-upload.sh
     - renamed to jenkinsci-upload.sh

  *modules/jenkins/files/slave_scripts/jenkinsci-upload.sh
     - created a versioned pom.xml file
     - deploy both hpi and pom file to repo.jenkins-ci.org

Change-Id: I6564e3ade04f3675ab7c269f26b8906385b5041f
Merge "deploy jenkins plugin pom.xml file."