Added role for installing 3rd party SonarQube plugins (#355)

* Added role for installing 3rd party SonarQube plugins

* Improve readability and simplify

roles/add-sonar-plugin/README.md

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+# Overview
+
+This role uses the OpenShift command-line tool to upload a JAR based SonarQube plugin into a running SonarQube instance, then restarts that running SonarQube instance so that the plugin gets loaded.
+
+# Usage
+
+```yaml
+- name: Install C++ Community Plugin For SonarQube
+  hosts: ocp-sonarqube
+
+  roles:
+  - add-sonar-plugin
+    vars:
+      plugin_url: https://github.com/SonarOpenCommunity/sonar-cxx/releases/download/cxx-1.2.2/sonar-cxx-plugin-1.2.2.1653.jar
+      install_location: /opt/sonarqube/extensions/plugins
+      namespace: labs-ci-cd
+      pod_prefix: sonarqube
+```
+
+# Testing
+* Deploy a [Labs CI/CD environment](https://github.com/rht-labs/labs-ci-cd)
+* Apply the role using the test playbook: `ansible-playbook -i inventory test.yml
+* Verify deployment after SonarQube restarts

roles/add-sonar-plugin/tasks/main.yml

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+---
+
+- name: Get JAR name
+  set_fact:
+    jar_name: "{{ plugin_url.split('/')[-1] }}"
+
+- name: Download the SonarQube plugin
+  get_url:
+    url: "{{ plugin_url }}"
+    dest: "/tmp/{{ jar_name }}"
+    mode: 0440
+
+## The Jinja2 template and the Go template in the following task conflict,
+## so the weird double-curly-braces surrounded by double-curly-braces is required.
+- name: Find sonarqube pod
+  command: >-
+      oc get pods --namespace={{ namespace }} -l="app==sonarqube"
+      -o jsonpath="{.items[0].metadata.name}"
+  register: pod_name_lines
+
+- name: Extract pod name
+  set_fact:
+    pod_name: "{{ pod_name_lines.stdout }}"
+
+- name: Copy plugin to SonarQube pod
+  command: "oc cp /tmp/{{ jar_name }} {{ namespace }}/{{ pod_name }}:{{ install_location }}/{{ jar_name }}"
+
+- name: Redeploy SonarQube
+  command: "oc rollout latest --namespace={{ namespace }} {{ pod_prefix }}"

roles/add-sonar-plugin/tests/inventory

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+[ocp-sonarqube]
+localhost ansible_connection=local

roles/add-sonar-plugin/tests/roles

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+../..

roles/add-sonar-plugin/tests/test.yml

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+- name: Install C++ Community Plugin For SonarQube
+  hosts: ocp-sonarqube
+
+  roles:
+  - role: add-sonar-plugin
+    vars:
+      plugin_url: https://github.com/SonarOpenCommunity/sonar-cxx/releases/download/cxx-1.2.2/sonar-cxx-plugin-1.2.2.1653.jar
+      install_location: /opt/sonarqube/extensions/plugins
+      namespace: deven-role-test
+      pod_prefix: sonarqube