Add support for ipv6 to net-vpc module

[ludoo]

Fixes #1530

[Avinash-jayakumar]

Change looks good. the "private_ipv6_google_access" does not take true or false value. If we give true or false, terraform plan shows a change in resource everytime we run the code. Setting it to null or not having that attribute should work fine. I Could see you have commented it.

[ludoo]

Change looks good. the "private_ipv6_google_access" does not take true or false value. If we give true or false, terraform plan shows a change in resource everytime we run the code. Setting it to null or not having that attribute should work fine. I Could see you have commented it.

Yep. If you look at the code it's a string, but there's no value that can be set according to the API so I commented it out.

(edited, first reply was from mobile)