Replace semicolons by commas in options

[lystor]

What type of PR is this?
/kind bug

What this PR does / why we need it:
Fix syntax error in /etc/NetworkManager/conf.d/dns.conf by replacing semicolons with commas in 'options'.

Which issue(s) this PR fixes:

Fixes #9816

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Replace semicolons by commas in networkmanager dns configuration options 

[k8s-ci-robot]

Hi @lystor. Thanks for your PR.

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[mzaian]

Thanks @lystor
/lgtm
/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lystor, mzaian

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