Ignore Ansible .retry files
Ignore Ansible .retry files

Play execution can result in a <playbook_name>.retry file
being created in the playbooks directory. These should be
ignored by the git repo.

Change-Id: I947c6f8f2be9fb9e8ca084f1366e38159e583432

robb-romans/openstack-ansible,openstack/openstack-ansible,os-cloud/os-ansible-deployment,stackforge/os-ansible-deployment,weezer/openstack-ansible,bunchc/openstack-ansible,BjoernT/os-ansible-deployment,mancdaz/openstack-ansible,bunchc/openstack-ansible,cloudnull/os-ansible-deployment,cloudnull/os-ansible-deployment,cfarquhar/openstack-ansible,Logan2211/openstack-ansible,stackforge/os-ansible-deployment,BjoernT/os-ansible-deployment,BjoernT/openstack-ansible,yanyao/newton,yanyao/openstack-ansible,openstack/openstack-ansible,weezer/openstack-ansible,robb-romans/openstack-ansible,yanyao/openstack-ansible,BjoernT/openstack-ansible,yanyao/newton,cfarquhar/openstack-ansible,os-cloud/os-ansible-deployment,BjoernT/os-ansible-deployment,Logan2211/openstack-ansible,mancdaz/openstack-ansible