Changes

• Removed the qemu-guest-agent as it is rarely used for debug.
  Note, it was in the image but not started.
• Use tiny kernel profile and turn off unneccesary kernel feature to minimize the kernel code.
  This Removes a bunch of unused drivers such as USB, keyboard, mouse.
• Removed login-related files from production image
  They are only disabled in prod image in the past. This PR Remove the exec files as well.
• Use Config-B of OVMF