[Bug 1885169] Fix included in openstack/neutron 16.4.1

[OpenStack Infra]

This issue was fixed in the openstack/neutron 16.4.1 release.

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https://bugs.launchpad.net/bugs/1885169

Title:
  Some arping version only accept integer number as -w argument

Status in devstack:
  Fix Released
Status in neutron:
  Fix Released
Status in neutron package in Ubuntu:
  Fix Released
Status in neutron source package in Focal:
  Fix Released

Bug description:
  For example, Bionic v2.19-4 accepts "4.5", but not Focal v2.20-1.

  LOG:
  stack at u20:/opt/stack$ arping -A -c 3 -w 4.5 -I br-ex 192.168.20.70
  arping: invalid argument: '4.5'

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