Remove node ppa for jenkins-worker.

Platform is now using nodeenv so we do not need node installed globally on
jenkins-workers.

playbooks/roles/jenkins_worker/defaults/main.yml

@@ -3,14 +3,10 @@ jenkins_user: "jenkins"
 jenkins_group: "jenkins"
 jenkins_home: /home/jenkins
 
-# repo for nodejs
-jenkins_chrislea_ppa: "ppa:chris-lea/node.js"
-
 jenkins_edx_platform_version: master
 
 # System packages
 jenkins_debian_pkgs:
-    - nodejs
     - pkg-config
     - libffi-dev
     - python-dev

playbooks/roles/jenkins_worker/tasks/system.yml

@@ -26,10 +26,6 @@
     owner={{ jenkins_user }} group={{ jenkins_group }} mode=400
   ignore_errors: yes
 
-# adding chris-lea nodejs repo
-- name: add ppas for current versions of nodejs
-  apt_repository: repo="{{ jenkins_chrislea_ppa }}"
-
 - name: Install system packages
   apt: pkg={{','.join(jenkins_debian_pkgs)}}
        state=present update_cache=yes