Add validate-undercloud role to perform idempotency and simple verification

Change-Id: I9b11d4e6b9c253f4db05a0e6da49abb7f73128bf

roles/validate-undercloud/defaults/main.yml

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+---
+undercloud_sanity_check_script: undercloud-sanity-check.sh.j2
+undercloud_sanity_check_log: "{{ working_dir }}/undercloud_sanity_check.log"
+undercloud_check_idempotency: false
+undercloud_check_sanity: false
+undercloud_reinstall_log: "{{ working_dir }}/undercloud_reinstall.log"
+

roles/validate-undercloud/meta/main.yml

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+dependencies:
+    - extras-common

roles/validate-undercloud/tasks/main.yml

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+- name: Reinstall the undercloud to check idempotency
+  shell: |
+    {{ working_dir }}/undercloud-install.sh > \
+    {{ undercloud_reinstall_log }} 2>&1
+  when: undercloud_check_idempotency|bool
+  tags:
+    - undercloud-validate
+
+- name: Create undercloud sanity check script
+  template:
+    src: "{{ undercloud_sanity_check_script }}"
+    dest: "{{ working_dir }}/undercloud-sanity-check.sh"
+    mode: 0755
+  tags:
+    - undercloud-scripts
+
+- name: check undercloud sanity
+  shell: |
+    {{ working_dir }}/undercloud-sanity-check.sh > \
+    {{ undercloud_sanity_check_log }} 2>&1
+  when: undercloud_check_sanity|bool
+  tags:
+    - undercloud-validate

roles/validate-undercloud/templates/undercloud-sanity-check.sh.j2

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+### --start_docs
+
+## Validate the undercloud installation
+## ====================================
+
+## * Set the uri of TripleO UI based on SSL usage
+## ::
+{% set ui_uri = "https://%s" % undercloud_network_cidr|nthhost(2)  if undercloud_generate_service_certificate|bool else "http://%s:3000" % undercloud_network_cidr|nthhost(1) %}
+
+## * Specify the function to test UI
+## ::
+function ui_sanity_check {
+    if [ -f "/etc/httpd/conf.d/25-tripleo-ui.conf" ]; then
+        if ! curl {{ ui_uri }} 2>/dev/null | grep -q 'TripleO'; then
+            echo "ERROR: TripleO UI front page is not loading."
+            exit 1
+        fi
+    fi
+}
+
+
+## * Check the answers from each undercloud service
+## ::
+
+set -x
+source {{ working_dir}}/stackrc
+openstack user list
+openstack catalog list
+nova service-list
+glance image-list
+neutron subnet-list
+neutron net-list
+neutron agent-list
+ironic node-list
+openstack stack list
+ui_sanity_check
+set +x
+
+### --stop_docs