Fix ansible lint

Ansible-lint is failing on physical-network.yml, which is a tasks file
rather than a playbook. Specify the two top-level playbooks only, and
ansible-lint will follow the includes.

Change-Id: I3499944939aa717a382d87f5c90236499539de60

tox.ini

@@ -67,8 +67,8 @@ setenv = ANSIBLE_LIBRARY = {toxinidir}/ansible/action_plugins/
 # Exclude roles downloaded from Galaxy (in the form 'author.role') from
 # linting.
 commands = bash -c "ansible-lint -vvv \
-                    $(find {toxinidir}/ansible -path '*.yml' \
-                          -not -path '{toxinidir}/ansible/roles/*.*/*' -print)"
+                    {toxinidir}/ansible/deploy.yml \
+                    {toxinidir}/ansible/teardown.yml"
 
 [testenv:releasenotes]
 deps =