Rename test environments, add a 3-node one

test/test-base/README.md

test/test-base/Vagrantfile

test/test-base/group_vars/all/vars.yml

test/test-base/hosts.yml

test/test-base/passwords.yml

test/test-base/services.yml

test/test-full/README.md

test/test-full/Vagrantfile

test/test-full/ansible.cfg

test/test-full/config.yml

test/test-full/group_vars/all/vars.yml

test/test-full/hosts.yml

test/test-full/passwords.yml

test/test-full/services.yml

test/test-full/site.yml

test/test-full/test.sh