Add proxy support to CRI-O service (#4607)

* Add proxy support to CRI-O service

The crio.service requires proxy environment variables when it's
deployed behind a corporated network. This change creates a systemd
configuration file when the proxy variables are defined.

* Remove unnecesary crio's tasks

roles/container-engine/cri-o/handlers/main.yml

@@ -0,0 +1,15 @@
+---
+- name: restart crio
+  command: /bin/true
+  notify:
+    - CRI-O | reload systemd
+    - CRI-O | reload crio
+
+- name: CRI-O | reload systemd
+  systemd:
+    daemon_reload: true
+
+- name: CRI-O | reload crio
+  service:
+    name: crio
+    state: restarted