add standard battery of tests

tests/deploy-apache.yml

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+---
+- hosts: all
+  vars_files:
+    - vars.yml
+  roles:
+    - myroles.deploystuff
+...

tests/do-nothing.yml

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+---
+- hosts: all
+  roles:
+    - myroles.deploystuff
+...

tests/inventory

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+servera.lab.example.com ansible_user=devops

tests/rollback.yml

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+---
+- hosts: all
+  become: yes
+  vars_files:
+    - vars.yml
+  tasks:
+    - name: ensure the service is stopped
+      service:
+        name: "{{ service }}"
+        state: stopped
+        enabled: no
+      when: service != None
+      ignore_errors: true
+
+    - name: ensure the firewall ports are closed
+      firewalld:
+        service: "{{ fwsvc }}"
+        state: disabled
+        immediate: true
+        permanent: true
+      when: fwsvc != None
+      ignore_errors: true
+
+    - name: remove the packages
+      yum:
+        name: "{{ packages }}"
+        state: absent
+
+    - name: remove any published templates
+      file:
+        path: "{{ item.dest }}"
+        state: absent
+      loop: "{{ configs }}"
+      when: configs is defined
+
+    - name: remove any static files
+      file:
+        path: "{{ item.dest }}"
+        state: absent
+      loop: "{{ staticfiles }}"
+      when: staticfiles is defined
+...

tests/vars.yml

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+packages:
+  - httpd
+test_programs:
+  - apachectl configtest
+service: httpd
+fwsvc: http