Additional conversations for the bug are happening in bug 1874544

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https://bugs.launchpad.net/bugs/1856375

Title:
  [linux-azure] Request to autoload mlx4/mlx5 modules for DPDK

Status in linux-azure package in Ubuntu:
  New

Bug description:
  Ubuntu 18.04 images in the marketplace do not automatically load the
  required mlx drivers. (mlx4_ib|mlx5_ib and mlx4_en|mlx5_en)

  Someone trying DPDK on Ubuntu 18.04 has raised an issue on Azure DPDK
  document(https://github.com/MicrosoftDocs/azure-docs/issues/44303).

  To reproduce, bring up an ubuntu 18.04 VM on Azure.  There you can see
  only mlx4_en but not the other one(mlx4_ib):

  # lsmod | grep mlx4
  mlx4_en               118784  0
  mlx4_core             294912  1 mlx4_en

  We would expect there to be 4 kernel modules loaded such as:
  mlx[4|5]_ib, rdma_cm, rdma_ucm, and ib_ipoib

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