openstack/devstack - devstack - OpenDev: Free Software Needs Free Tools

This was only working because the noVNC package on Ubuntu pulls
in oslo.utils.
Change-Id: I3733df3e2667f16082b3ff57d39cf086d81fbe02
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>

Currently, neutron tunnel endpoints must be IPv4 addresses,
i.e. $HOST_IP, although IPv6 endpoints are supported by most
drivers.
Create a TUNNEL_IP_VERSION variable to choose which host IP
to use, either HOST_IP or HOST_IPV6, and configure it in the
OVS and Linuxbridge agent driver files. The default is still
IPv4, but it can be over-ridden by specifying TUNNEL_ENDPOINT_IP
accordingly.
This behaves similar to the SERVICE_IP_VERSION option, which
can either be set to 4 or 6, but not 4+6 - the tunnel overhead
should be consistent on all systems in order not to have MTU
issues.
Must set the ML2 overlay_ip_version config option to match
else agent tunnel sync RPC will not work.
Must set the OVN external_ids:ovn-encap-ip config option to
the correct address.
Updated 'devstack-ipv6-only' job definition and verification role
that will set all services and tunnels to use IPv6 addresses.
Closes-bug: #1619476
Change-Id: I6034278dfc17b55d7863bc4db541bbdaa983a686

from Tempest to DevStack as it tests DevStack side of things and
is useful for projects not using Tempest.
Verbatim copy except for the devstack- prefix and the /devstack/
path.
Change-Id: Ie166730843f874b9c99e37244e460d7ad33b7eeb