yatinkarel 4a06685098 [OVN] Correctly set dns_server in dhcpv4/v6 options ...

When ovn/dns_servers consist of IPv6 dns nameservers,
it was getting added to IPv4 dhcp options also, and due to
this an invalid nameserver(last 4 octets of an IPv6 address)
is set in the instances.

This patch filters IPv4/IPv6 dns nameservers and set
dhcpv4/dhcpv6 options accordingly.

Also when dns_nameservers are not set for IPv6 subnets,
get those from ovn/dns_servers config or system nameservers
just like it's done with the IPv4 subnets. Updated
get_system_dns_resolvers to pick both IPv4/IPv6 valid
ips, this also requires bump of oslo.utils minimum version
to 4.8.0 to use strict option for IPv4[1].

Additionally fix some unit tests which were setting IPv4 dns
nameservers on the IPv6 subnets, this is not allowed with api.

[1] https://github.com/openstack/oslo.utils/commit/3288539

Closes-Bug: #1951816
Change-Id: I9f914e721201072e43a8c6c266ed97ca85fcc13d

2022-01-06 05:02:35 +00:00

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