Use stat module instead of "test -s"

Use native ansible functionality to get information about file

Change-Id: I7888971e817e4df45a8309be1be5dbde4d6d5171

deployment/tripleo-packages/tripleo-packages-baremetal-puppet.yaml

@@ -261,10 +261,13 @@ outputs:
           register: os_net_config_need_upgrade
           when: step|int == 3
         - name: Check that os-net-config has configuration
-          shell: test -s /etc/os-net-config/config.json
-          register: os_net_config_has_config
-          failed_when: false
           when: step|int == 3
+          stat:
+            path: /etc/os-net-config/config.json
+            get_attributes: false
+            get_checksum: false
+            get_mime: false
+          register: stat_config_json
         - block:
             - name: Upgrade os-net-config
               package: name=os-net-config state=latest
@@ -276,7 +279,7 @@ outputs:
           when:
             - step|int == 3
             - os_net_config_need_upgrade.stdout
-            - os_net_config_has_config.rc == 0
+            - stat_config_json.stat.exists
         # Exclude ansible until https://github.com/ansible/ansible/issues/56636
         # is available
         - name: Update all packages