Add check-network-gateway role

This patch adds this new role created from:
- validations/check-network-gateway.yaml

Change-Id: I92447680f04e6ea4d98e3b1345c844b453d1b9d7
Implements: blueprint validation-framework
Signed-off-by: Gael Chamoulaud <gchamoul@redhat.com>

playbooks/check-network-gateway.yaml

@@ -0,0 +1,12 @@
+---
+- hosts: undercloud
+  vars:
+    metadata:
+      name: Check network_gateway on the provisioning network
+      description: >
+        If `gateway` in `undercloud.conf` is different from `local_ip`,
+        verify that the gateway exists and is reachable.
+      groups:
+        - pre-introspection
+  roles:
+    - check-network-gateway

roles/check-network-gateway/meta/main.yml

@@ -0,0 +1,27 @@
+galaxy_info:
+  author: TripleO Validations Team
+  company: Red Hat
+  license: Apache
+  min_ansible_version: 2.4
+
+  platforms:
+  - name: CentOS
+    versions:
+    - 7
+  - name: RHEL
+    versions:
+    - 7
+
+  categories:
+    - cloud
+    - baremetal
+    - system
+  galaxy_tags: []
+    # List tags for your role here, one per line. A tag is a keyword that describes
+    # and categorizes the role. Users find roles by searching for tags. Be sure to
+    # remove the '[]' above, if you add tags to this list.
+    #
+    # NOTE: A tag is limited to a single word comprised of alphanumeric characters.
+    #       Maximum 20 tags per role.
+
+dependencies: []

roles/check-network-gateway/tasks/main.yml

@@ -0,0 +1,40 @@
+---
+- name: Get the path of tripleo undercloud config file
+  become: true
+  hiera:
+    name: "tripleo_undercloud_conf_file"
+
+- name: Get the local_subnet name from the undercloud_conf file
+  become: True
+  ini:
+    path: "{{ tripleo_undercloud_conf_file }}"
+    section: DEFAULT
+    key: local_subnet
+    ignore_missing_file: True
+  register: local_subnet
+
+- name: Get gateway value from the undercloud.conf file
+  become: true
+  ini:
+    path: "{{ tripleo_undercloud_conf_file }}"
+    section: "{% if local_subnet.value %}{{ local_subnet.value }}{% else %}ctlplane-subnet{% endif %}"
+    key: gateway
+    ignore_missing_file: True
+  register: gateway
+
+- name: Get local_ip value from the undercloud.conf file
+  become: true
+  ini:
+    path: "{{ tripleo_undercloud_conf_file }}"
+    section: DEFAULT
+    key: local_ip
+    ignore_missing_file: True
+  register: local_ip
+
+- name: Test network_gateway if different from local_ip
+  icmp_ping:
+    host: "{{ gateway.value | default('0.0.0.0') }}"
+  when: >
+    "local_ip.value | default('0.0.0.0') | ipaddr('address')"
+    !=
+    "gateway.value | default('0.0.0.0') | ipaddr('address')"

roles/check-network-gateway/vars/main.yml

@@ -0,0 +1,8 @@
+---
+metadata:
+  name: Check network_gateway on the provisioning network
+  description: >
+    If `gateway` in `undercloud.conf` is different from `local_ip`,
+    verify that the gateway exists and is reachable.
+  groups:
+    - pre-introspection