Update default plugin/devfile registries to use prod-preview

Update the default registries used in che.properties to use the
prod-preview deployments instead of production. This is to avoid issues
where snapshot changes of registries and che defaults are incompatible
with the deployment on production.

Signed-off-by: Angel Misevski <amisevsk@redhat.com>

assembly/assembly-wsmaster-war/src/main/webapp/WEB-INF/classes/che/che.properties

@@ -583,12 +583,12 @@ che.workspace.plugin_broker.wait_timeout_min=3
 # Workspace tooling plugins registry endpoint. Should be a valid HTTP URL.
 # Example: http://che-plugin-registry-eclipse-che.192.168.65.2.nip.io
 # In case Che plugins tooling is not needed value 'NULL' should be used
-che.workspace.plugin_registry_url=https://che-plugin-registry.openshift.io/v3
+che.workspace.plugin_registry_url=https://che-plugin-registry.prod-preview.openshift.io/v3
 
 # Devfile Registry endpoint. Should be a valid HTTP URL.
 # Example: http://che-devfile-registry-eclipse-che.192.168.65.2.nip.io
 # In case Che plugins tooling is not needed value 'NULL' should be used
-che.workspace.devfile_registry_url=https://che-devfile-registry.openshift.io/
+che.workspace.devfile_registry_url=https://che-devfile-registry.prod-preview.openshift.io/
 
 # Configures in which way secure servers will be protected with authentication.
 # Suitable values: