fix resolved config

[liupeng0518]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake
/kind bug

What this PR does / why we need it:
The following configuration is now generated when nodelocaldns is not enabled:

root@node1:~# cat /etc/systemd/resolved.conf 
[Resolve]
DNS=1 6 9 . 2 5 4 . 2 5 . 1 0
FallbackDNS=
Domains=default.svc.cluster.local svc.cluster.local
#LLMNR=no
#MulticastDNS=no
DNSSEC=no
Cache=no-negative
#DNSStubListener=yes

the dns server is error: 1 6 9 . 2 5 4 . 2 5 . 1 0,And we should use the CoreDNS server address.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[cristicalin]

Thanks for the fix @liupeng0518

/lgtm

[floryut]

Ok merging before release

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, liupeng0518

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