Added all files

examples/013_wait_for/playbook/hostname.yml

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+---
+  - hosts: all
+    tasks:
+      - name: get server hostname
+        command: hostname

examples/013_wait_for/playbook/stack_restart.yml

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+---
+# Bring stack down
+- hosts: loadbalancer
+  become: true
+  tasks:
+    - service: name=nginx state=stopped
+    - wait_for: port=80 state=drained
+
+- hosts: webserver
+  become: true
+  tasks:
+    - service: name=apache2 state=stopped
+    - wait_for: port=80 state=stopped
+
+# Restart mysql
+- hosts: database
+  become: true
+  tasks:
+    - service: name=mysql state=restarted
+    - wait_for: port=3306 state=started
+
+# Bring stack up
+- hosts: webserver
+  become: true
+  tasks:
+    - service: name=apache2 state=started
+    - wait_for: port=80
+
+- hosts: loadbalancer
+  become: true
+  tasks:
+    - service: name=nginx state=started
+    - wait_for: port=80

examples/013_wait_for/playbook/stack_status.yml

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+---
+- hosts: loadbalancer
+  become: true
+  tasks:
+    - name: verify nginx service
+      command: service nginx status
+
+    - name: verify nginx is listening on 80
+      wait_for: port=80 timeout=3
+
+- hosts: webserver
+  become: true
+  tasks:
+    - name: verify apache2 service
+      command: service apache2 status
+
+    - name: verify apache2 is listening on 80
+      wait_for: port=80 timeout=3
+
+- hosts: database
+  become: true
+  tasks:
+    - name: verify mysql service
+      command: service mysql status
+
+    - name: verify mysql is listening on 3306
+      wait_for: port=3306 timeout=3