Revert explicit docker registry address

.gitlab-industrial-ci-kinetic-no-rosinstall.yml

-image: tecnalia-docker-dev.artifact.tecnalia.com/docker:git
+image: docker:git
 
 variables:
   TMPDIR: /builds/${CI_PROJECT_NAMESPACE}
@@ -157,7 +157,7 @@ file_syntax:
 ##########################################################
 adoc_syntax:
   stage: postcheck
-  image: tecnalia-docker-dev.artifact.tecnalia.com/alpine
+  image: alpine
   before_script:
     - apk add --update curl asciidoctor bash
   script: