rescan the container registry after deleting the image, it will still show as installed.

[Yaminyam]

Summary  

[Provide a brief description of the bug.]  

• Currently, there is no way to delete an image in http://backend.ai .
  So I have to manually delete the image, but even if I run a rescan after deleting it, it is still displayed as an installed image.

Steps to Reproduce  

[Outline the steps to consistently reproduce the issue.]  

Expected Behavior  

[Describe the expected result if the bug were resolved.]  

Actual Behavior  

[Describe what actually happens when the bug occurs.]  

Logs/Errors  

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