Create/refactor lightbulb-control and lightbulb-instructor roles for provisioner

[tima]

This is part of the refactor of the lab provisioner to create a more flexible lab provisioner to handle the expanding scope of lightbulb content. (See #141)

lightbulb-control

WAS: roles/control_node

NOTE: RHEL7/CentOS7 only here

1. install and enable EPEL repos
2. install base packages
   • vim
   • git
   • wget [NEW]
   • sshpass
3. install ansible
   • pip or yum? needs to be an optional switch to install or not at a minimum. (Issue here)
4. clone lightbulb -- locally to temp directory -- run once [NEW]
   • This would have been helpful during the v2 overhaul: Implement optional git version and url to lightbulb fetch task #113
5. synchronize applicable files from local repo into user home directory [NEW]
   • Skip if instructor?
6. Install ansible.cfg and vimrc in home student directory
7. Create lab inventory directory
   • necessary? just drop file in next step to home as “hosts”? if yes the ansible.cfg template needs to be updated.
8. Upload student's static inventory file

lightbulb-instructor

[NEW] Fold into the lightbulb-control role and wrap in a block conditional?

NOTE: There could be multiple instructors -- how to flag users as instructors? boolean in users dict?

1. upload instructor lab inventory
   • alternative static inventory to their personal lab inventory. Issue here.
2. clone lightbulb to instructor home directory