Added handler to restart gitlab-runner service on global setup change.

handlers/main.yml

 ---
-# handlers file for gitlab-runner
+- name: restart_gitlab_runner
+  service: name=gitlab-runner state=restarted

tasks/global-setup.yml

@@ -6,6 +6,7 @@
     line: '\1concurrent = {{ gitlab_runner_concurrent }}'
     state: present
     backrefs: yes
+  notify: restart_gitlab_runner
 
 - name: Set docker privileged option
   lineinfile:
@@ -14,4 +15,5 @@
     line: '\1privileged = {{ gitlab_runner_docker_privileged | lower}}'
     state: present
     backrefs: yes
+  notify: restart_gitlab_runner