[Bug 1917475] Re: RBAC Permissions too strict for Port_Binding table

[Frode Nordahl]

Fixes has been applied upstream for all versions of OVN and we are
awaiting upstream to cut point releases to get these and other updates
into Ubuntu. We are also working on extending the upstream tests to
encompass testing with RBAC by default.

While waiting for that I have picked the relevant fixes into a package
provided through a PPA [0].

0: https://launchpad.net/~fnordahl/+archive/ubuntu/lp1917475

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https://bugs.launchpad.net/bugs/1917475

Title:
  RBAC Permissions too strict for Port_Binding table

Status in ovn package in Ubuntu:
  In Progress

Bug description:
  When using Openstack Ussuri with OVN 20.03 and adding a floating IP
  address to a unbound port the ovn-controller on the hypervisor
  repeatedly reports:

  2021-03-02T10:33:35.517Z|35359|ovsdb_idl|WARN|transaction error: {"details":"RBAC rules for client \"juju-eab186-zaza-d26c8c079cc7-11.project.serverstack\" role \"ovn-controller\" prohibit modification of table \"Port_Binding\".","error":"permission error"}
  2021-03-02T10:33:35.518Z|35360|main|INFO|OVNSB commit failed, force recompute next time.

  The seams to be because the ovn-controller needs to update the
  virtual_parent attribute of the port binding *2 but that is not
  included in the list of permissions allowed by the ovn-controller role
  *1

  *1 https://github.com/ovn-org/ovn/blob/aa8ef5588c119fa8615d78288a7db7e3df2d6fbe/northd/ovn-northd.c#L11331-L11332
  *2 https://pastebin.ubuntu.com/p/4CfcxgDgdm/

  Disabling rbac by changing the role to "" and stopping and starting
  the southbound db listener results in the port being immediately
  updated and the floating IP can be accessed.

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