rename from testing/docker/builder-hgrpm/Dockerfile
rename to testing/docker/builder-hgrpm-centos6/Dockerfile

rename from testing/docker/builder-hgrpm/entrypoint.sh
rename to testing/docker/builder-hgrpm-centos6/entrypoint.sh

rename from testing/docker/builder-hgrpm/rpmserver.py
rename to testing/docker/builder-hgrpm-centos6/rpmserver.py

--- a/testing/vcttesting/docker.py
+++ b/testing/vcttesting/docker.py
@@ -1301,17 +1301,17 @@ class Docker(object):
             for filename, data in res.json().items():
                 files[filename] = base64.b64decode(data)
 
         self.client.remove_container(container, v=True)
 
         return files
 
     def build_mercurial_rpms(self):
-        return self._get_files_from_http_container('hgrpm',
+        return self._get_files_from_http_container('hgrpm-centos6',
             'Generating RPMs...')
 
     def get_full_image(self, image):
         for i in self.client.images():
             iid = i['Id']
             if iid.startswith('sha256:'):
                 iid = iid[7:]