Merge pull request #4927 from intellectronica/intellectronica/docker-identify-private-repos-backport

Update cloud/docker: if the image name containes a repository, strip it.

library/cloud/docker

@@ -263,6 +263,8 @@ class DockerManager:
     
     
     def get_split_image_tag(self, image):
+        if '/' in image:
+            image = image.split('/')[1]
         tag = None
         if image.find(':') > 0:
             return image.split(':')