DRY .kitchen.yml using YAML references

.kitchen.yml

---
platforms:

- name: ubuntu-12.04
- name: centos-6.4

suites:

- name: backend-6.2
  run_list: &backend
    - recipe[foo-qa::backend]
  attributes: &legacy
    foo:
      version: 6.2.2

- name: backend-7.0
  run_list: *backend
  attributes: &70
    foo:
      version: 7.0.1

- name: backend-7.2
  run_list: *backend
  attributes: &72
    foo:
      version: 7.2.2

- name: backend-7.4
  run_list: *backend
  attributes: &74
    foo:
      version: 7.4.1

- name: office-7.4
  run_list: &office
    - recipe[foo-qa::backend]
    - recipe[foo::office]
  attributes: *74

- name: office-7.2
  run_list: *office
  attributes: *72

- name: office-7.0
  run_list: *office
  attributes: *70

- name: ui-7.4
  run_list: &ui
    - recipe[foo-qa]
    - recipe[foo::ui]
  attributes: *74

- name: ui-7.2
  run_list: *ui
  attributes: *72

- name: ui-7.0
  run_list: *ui
  attributes: *70

symlinks for sharing integration tests

$ ls -ld test/integration/backend*
drwxr-xr-x  3 srenatus  staff  102 17 Dec 15:31 test/integration/backend
lrwxr-xr-x  1 srenatus  staff    7 17 Dec 16:00 test/integration/backend-7.0 -> backend
lrwxr-xr-x  1 srenatus  staff    7 17 Dec 16:00 test/integration/backend-7.2 -> backend
lrwxr-xr-x  1 srenatus  staff    7 17 Dec 16:00 test/integration/backend-7.4 -> backend