- hosts: all
  roles:
    - run-devstack
    - role: bindep
      bindep_profile: test
      bindep_dir: "{{ zuul_work_dir }}"
    - test-setup
    - ensure-tox
    - role: tox-siblings
      when: tox_install_siblings

- hosts: all
  roles:
    - run-devstack
    - role: bindep
      bindep_profile: test
      bindep_dir: "{{ zuul_work_dir }}"
    - test-setup
    - ensure-tox

Remove use of tox-siblings role
Remove use of tox-siblings role

Its functionality has been merged into the tox role, so is no longer
needed.

Change-Id: Id952ddf5b140185a1bf6f5e9dd28798c6380b209
Depends-On: Id61ae52d48b28cfc2221cb556a1c1f7c6dfd60dd
