Service Directory Cloud DNS integration

[drebes]

Release Note Template for Downstream PRs (will be copied)

dns: Added `service_directory_config` field to`google_dns_managed_zone` (Beta only)

[modular-magician]

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

Diff report:

Terraform GA: Diff ( 1 file changed, 39 insertions(+))
Terraform Beta: Diff ( 3 files changed, 241 insertions(+))
TF OiCS: Diff ( 4 files changed, 130 insertions(+))
Inspec: Diff ( 6 files changed, 82 insertions(+))

[slevenick]

Just one small change, otherwise looks good!

[modular-magician]

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

Diff report:

Terraform GA: Diff ( 1 file changed, 39 insertions(+))
Terraform Beta: Diff ( 3 files changed, 241 insertions(+))
TF OiCS: Diff ( 4 files changed, 130 insertions(+))
Inspec: Diff ( 6 files changed, 82 insertions(+))