Improve deployer UX by limiting failure output potential

This change will improve the deployer UX by ensuring that the log output does not show
failed tasks. While the potential for failed tasks should be rescued, and complete
successfully, the output confusing and could result in the operator taking unnecessary
debugging steps during a deployment. To ensure that the output is accurate and easy
to understand the playbook will now stat the required file and the needed blocks
will only execute when the appropriate conditions are met.

Change-Id: I0e69f44a6e06926a8987defa96c7ffac167ccdb5
Signed-off-by: Kevin Carter <kecarter@redhat.com>

tripleo_ansible/playbooks/cli-enable-ssh-admin.yaml

@@ -87,59 +87,74 @@
         ssh_key_file: "{{ ansible_home }}/.ssh/id_rsa"
       become: true
 
+    - name: Stat key file
+      stat:
+        path: "{{ defined_user_private_key_file }}"
+      register: key_check
+
     - name: Key block
-      run_once: true
+      when:
+        - user_public_key is undefined
+        - user_private_key is undefined
+        - user_private_key_file is undefined
       block:
-        - name: Get local private key
-          slurp:
-            src: "{{ defined_user_private_key_file }}"
-          register: private_key_get
-          become: true
+        - name: Read key block
+          run_once: true
+          when:
+            - key_check.stat.exists | bool
+          block:
+            - name: Get local private key
+              slurp:
+                src: "{{ defined_user_private_key_file }}"
+              register: private_key_get
+              become: true
 
-        - name: Get local public key
-          slurp:
-            src: "{{ defined_user_private_key_file }}.pub"
-          register: public_key_get
-          become: true
+            - name: Get local public key
+              slurp:
+                src: "{{ defined_user_private_key_file }}.pub"
+              register: public_key_get
+              become: true
 
-        - name: Set key facts
-          set_fact:
-            user_public_key: "{{ public_key_get['content'] | b64decode }}"
-            user_private_key: "{{ private_key_get['content'] | b64decode }}"
-            user_private_key_file: "{{ defined_user_private_key_file }}"
-      rescue:
-        - name: Get local private key
-          slurp:
-            src: "{{ ansible_home }}/.ssh/id_rsa"
-          register: private_key_get
-          become: true
+            - name: Set key facts
+              set_fact:
+                user_public_key: "{{ public_key_get['content'] | b64decode }}"
+                user_private_key: "{{ private_key_get['content'] | b64decode }}"
+                user_private_key_file: "{{ defined_user_private_key_file }}"
 
-        - name: Get local public key
-          slurp:
-            src: "{{ ansible_home }}/.ssh/id_rsa.pub"
-          register: public_key_get
-          become: true
+        - name: Read and create key block
+          run_once: true
+          when:
+            - not (key_check.stat.exists | bool)
+          block:
+            - name: Get local private key
+              slurp:
+                src: "{{ ansible_home }}/.ssh/id_rsa"
+              register: private_key_get
+              become: true
 
-        - name: Set key facts
-          set_fact:
-            user_public_key: "{{ public_key_get['content'] | b64decode }}"
-            user_private_key: "{{ private_key_get['content'] | b64decode }}"
+            - name: Get local public key
+              slurp:
+                src: "{{ ansible_home }}/.ssh/id_rsa.pub"
+              register: public_key_get
+              become: true
 
-        - name: Write tripleo private key
-          copy:
-            content: "{{ user_private_key }}"
-            dest: "{{ defined_user_private_key_file }}"
-            mode: "0600"
+            - name: Write tripleo private key
+              copy:
+                content: "{{ private_key_get['content'] | b64decode }}"
+                dest: "{{ defined_user_private_key_file }}"
+                mode: "0600"
 
-        - name: Write tripleo public key
-          copy:
-            content: "{{ user_public_key }}"
-            dest: "{{ defined_user_private_key_file }}.pub"
-            mode: "0640"
+            - name: Write tripleo public key
+              copy:
+                content: "{{ public_key_get['content'] | b64decode }}"
+                dest: "{{ defined_user_private_key_file }}.pub"
+                mode: "0640"
 
-        - name: Set key file fact
-          set_fact:
-            user_private_key_file: "{{ defined_user_private_key_file }}"
+            - name: Set key file fact
+              set_fact:
+                user_public_key: "{{ public_key_get['content'] | b64decode }}"
+                user_private_key: "{{ private_key_get['content'] | b64decode }}"
+                user_private_key_file: "{{ defined_user_private_key_file }}"
 
     - name: Ensure user can ssh to localhost
       authorized_key: