[Bug 1554397] [NEW] dpdk-init fails due to missing modules in virt environments

[ChristianEhrhardt]

Public bug reported:

In e.g. cloud images there is only the minimal "linux-image" which does
not pull in "linux-image-extra".

Now DPDK doesn't need linux-image-extra in such environments for there is a virtio pmd driver.
But if people want to experiment with e.g. uio_pci_generic drivers in there the init scripts will crash due to the missing kernel module.

I suggest two fixes:
1. make linux-image-extra-virtual a suggests of dpdk (recommends or depends would be too hard given the relation)
2. further harden the init script to gracefully detect and warn about it instead of failing
3. add a comment about the need into /etc/dpdk/interfaces so people can read it while configuring instead when failing

** Affects: dpdk (Ubuntu)
     Importance: Medium
     Assignee: ChristianEhrhardt (paelzer)
         Status: Triaged

** Changed in: dpdk (Ubuntu)
       Status: New => Triaged

** Changed in: dpdk (Ubuntu)
   Importance: Undecided => Medium

** Changed in: dpdk (Ubuntu)
     Assignee: (unassigned) => ChristianEhrhardt (paelzer)

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https://bugs.launchpad.net/bugs/1554397

Title:
  dpdk-init fails due to missing modules in virt environments

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