Adding ssh keys and known_host file for connecting to github to download the codebase.

Also adding a playbook to install the codebase.
Moving ldap specific files one directory down.
Creating inventory folder and renaming main playbook to be setup_portal.yml. Also updated Vagrantfile.
Merge pull request #7 from Appdynamics/feature/testing_new_ec2_instance

Feature/testing new ec2 instance. This looks good to me. I had made a comment on one of those commits (accidentally as portal-jenkins). Merging the Pull Request.