Prevent download and creation of default Cirros glance image

- downloading the Cirros image fails in glance-bootstrap if
  the hardcoded requested image is not found
- to workaround this issue, we disable the download and creation
  of the Cirros image in glance-bootstrap through the overrides
  -> this has no other impact as the image can be created after
     the chart's installation using "openstack image create"

Change-Id: I418eb236f5eceb0124eb73787fe12e2f0aa2d9e1
Closes-Bug: 1814142
Signed-off-by: Irina Mihai <irina.mihai@windriver.com>

sysinv/sysinv/sysinv/sysinv/helm/glance.py

@@ -36,6 +36,7 @@ class GlanceHelm(openstack.OpenstackBaseHelm):
                 'storage': self._get_storage_overrides(),
                 'conf': self._get_conf_overrides(),
                 'images': self._get_images_overrides(),
+                'bootstrap': self._get_bootstrap_overrides()
             }
         }
 
@@ -161,6 +162,15 @@ class GlanceHelm(openstack.OpenstackBaseHelm):
 
         return conf
 
+    def _get_bootstrap_overrides(self):
+        # By default, prevent the download and creation of the Cirros image.
+        # TODO: Remove if/when pulling from external registries is supported.
+        bootstrap = {
+            'enabled': False
+        }
+
+        return bootstrap
+
     def _get_primary_ceph_backend(self):
         try:
             backend = self.dbapi.storage_backend_get_by_name(