Ensure /etc/sysconfig/proxy for openSUSE bootstrap (#5445)

The playbook that bootstrap openSUSE servers assumes that the
/etc/sysconfig/proxy file exists but the execution fails when
these file is not present. This change guarantees its existence.

roles/bootstrap-os/tasks/bootstrap-opensuse.yml

 ---
 # OpenSUSE ships with Python installed
 
+- name: Check that /etc/sysconfig/proxy file exists
+  stat:
+    path: /etc/sysconfig/proxy
+  register: stat_result
+
+- name: Create the /etc/sysconfig/proxy empty file
+  file:
+    path: /etc/sysconfig/proxy
+    state: touch
+  when:
+    - http_proxy is defined or https_proxy is defined
+    - not stat_result.stat.exists
+
 - name: Set the http_proxy in /etc/sysconfig/proxy
   lineinfile:
     path: /etc/sysconfig/proxy