Make ceph-ansible run handle missing "{{ playbook_dir }}/ssh_key"

The SSH private key will normally be in $HOME/.ssh/id_rsa_tripleo
so if that key is present, then use it. This is a more reliable
location than "{{ playbook_dir }}/ssh_key", which will go away
with Mistral. This change is also backwards compatible as it
will fall back to using "{{ playbook_dir }}/ssh_key" in the case
that $HOME/.ssh/id_rsa_tripleo is missing. Covers one extra case
where CephAnsibleEnvironmentVariables/ANSIBLE_PRIVATE_KEY_FILE
might have been needed.

Also switches nodes_uuid_command to use ceph-ansible's ansible.cfg as
config-download may not always provide "{{ playbook_dir }}/ansible.cfg"

Change-Id: Ic7e20844877492d7c4b85f7579e90f6c9de355ec
Closes-Bug: #1868864

tripleo_ansible/roles/tripleo_ceph_uuid/tasks/gather.yml

@@ -19,7 +19,7 @@
     nodes_uuid_list:
       - ANSIBLE_LOG_PATH="{{ playbook_dir }}/ceph-ansible/nodes_uuid_command.log"
       - ANSIBLE_SSH_CONTROL_PATH_DIR="{{ playbook_dir }}/ceph-ansible/"
-      - ANSIBLE_CONFIG="{{ playbook_dir }}/ansible.cfg"
+      - ANSIBLE_CONFIG=/usr/share/ceph-ansible/ansible.cfg
       - ANSIBLE_REMOTE_TEMP=/tmp/nodes_uuid_tmp
       - "{{ calling_ansible_environment_variables|join(' ') }}"
       - "{{ ceph_ansible_environment_variables|join(' ') }}"

tripleo_ansible/roles/tripleo_ceph_work_dir/tasks/get_ssh_private_key.yml

@@ -14,17 +14,35 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-- name: detect private key file
+- name: detect private key file in $HOME/.ssh/id_rsa_tripleo
   # needs become to be able to read the ssh private key
   become: true
   stat:
-    path: "{{ playbook_dir }}/ssh_private_key"
+    path: "{{ lookup('env','HOME') }}/.ssh/id_rsa_tripleo"
   register: detect_private_key_file
 
 - name: set private key file
   # needs become to be able to read the ssh private key
   become: true
   set_fact:
-    ceph_ansible_private_key_file: "{{ playbook_dir }}/ssh_private_key"
+    ceph_ansible_private_key_file: "{{ lookup('env','HOME') }}/.ssh/id_rsa_tripleo"
   when:
     - detect_private_key_file.stat.exists | bool
+
+- name: Falling back to looking for ssh_private_key in playbook_dir
+  when: ceph_ansible_private_key_file is undefined
+  block:
+    - name: detect private key file in playbook_dir
+      # needs become to be able to read the ssh private key
+      become: true
+      stat:
+        path: "{{ playbook_dir }}/ssh_private_key"
+      register: detect_private_key_file
+
+    - name: set private key file
+      # needs become to be able to read the ssh private key
+      become: true
+      set_fact:
+        ceph_ansible_private_key_file: "{{ playbook_dir }}/ssh_private_key"
+      when:
+        - detect_private_key_file.stat.exists | bool