[Bug 1736510] Re: openvswitch agent should start only after network is ready

[Dr. Jens Harbott]

Proposed patch:
https://git.launchpad.net/~j-harbott/ubuntu/+source/neutron/commit/?id=287059e2c3816480d669eabb7b3243c379420aba

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https://bugs.launchpad.net/bugs/1736510

Title:
  openvswitch agent should start only after network is ready

Status in neutron package in Ubuntu:
  Confirmed

Bug description:
  During rebooting a node, neutron-openvswitch agent sometimes fails
  directly after booting with a message like

  2017-12-05 13:33:23.793 1388 ERROR
  neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [-]
  Tunneling can't be enabled with invalid local_ip '1.2.3.4'. IP
  couldn't be found on this host's interfaces.

  So it seems that it is being started too early, it should wait until
  the static network configuration has been finished. Adding

  "After=network.target"

  to the definition of neutron-openvswitch-agent.service seems to
  mitigate the issue, but perhaps there is a better solution still?

  Affects at least Ocata UCA, not tested on Pike yet.

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