ansible-lint: Add note for why rule 602 is skipped
ansible-lint: Add note for why rule 602 is skipped

ansible-lint rule 602 has unresolved issues as discussed
in https://github.com/ansible/ansible-lint/issues/457

Until the issues are resolved, we leave this rule skipped.

Change-Id: I9c43939ed558151442cfacbed5060ae383378afe

redhat-openstack/infrared,redhat-openstack/infrared,redhat-openstack/infrared