[Bug 1912847] Re: ovs-vswitchd should consider lack of DPDK support fatal

[Drew Freiberger]

Added PR for layer:ovn which will need to later be re-synced into charm-
ovn-chassis.

https://github.com/openstack-charmers/charm-layer-ovn/pull/47

** Also affects: charm-helpers
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1912847

Title:
  ovs-vswitchd should consider lack of DPDK support fatal

Status in Charm Helpers:
  New
Status in OpenStack neutron-gateway charm:
  In Progress
Status in OpenStack neutron-openvswitch charm:
  In Progress
Status in charm-ovn-chassis:
  New
Status in openvswitch package in Ubuntu:
  New

Bug description:
  If ovs-vswitchd without DPDK support is run on a system which requires
  it, the following error is logged:

  2021-01-14T06:01:54.608Z|00007|dpdk|ERR|DPDK not supported in this
  copy of Open vSwitch.

  Unfortunately this is not a fatal error and ovs-vswitchd continues on.
  It would be much easier from a monitoring and operator ease-of-
  diagnosis perspective, if ovs-vswitchd exited after this error
  message.

  (ovs-vswitchd was running without DPDK support due to LP #1836713)

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