Use self link for DNS networks

[emilymye]

Release Note Template for Downstream PRs (will be copied)

Was previously switched to ID but DNS requires full self link

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform Beta: Diff ( 2 files changed, 4 insertions(+), 4 deletions(-))
TF OiCS: Diff ( 1 file changed, 2 insertions(+), 2 deletions(-))

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform Beta: Diff ( 2 files changed, 4 insertions(+), 4 deletions(-))
TF OiCS: Diff ( 1 file changed, 2 insertions(+), 2 deletions(-))