message: docker: Pretty print image name when building.
diff: @@ -232,11 +232,11 @@ class DockerBuilder(drake.Builder):
  shutil.rmtree(str(g))
  else:
  os.remove(g)
  - self.cmd('Docker build image %s' % self.__path,
  + tag = ':'.join((self.__image.repository, self.__image.tag))
  + self.cmd('Docker build image %s' % tag,
  ['docker', 'build',
  '--force-rm',
  - '--tag', '%s:%s' % (self.__image.repository,
  - self.__image.tag),
  + '--tag', tag,
  self.__path,
  ],
  throw = True)
  