Bootstrap Ansible fails if partial keypair exists
Bootstrap Ansible fails if partial keypair exists

Bootstrap Ansible fails if either a public or private key already exists in `.ssh`.

The check for keys is doing an `AND`, when it should be doing an `OR`.

Change-Id: I7b520bbe14af4ddfffcdbff92104e3b8caebd393
Closes-Bug: 1711398

stackforge/os-ansible-deployment,stackforge/os-ansible-deployment,bunchc/openstack-ansible,openstack/openstack-ansible,yanyao/openstack-ansible,cfarquhar/openstack-ansible,bunchc/openstack-ansible,openstack/openstack-ansible,cfarquhar/openstack-ansible,yanyao/openstack-ansible