Cleanup ipv6

[tyler-lloyd]

Issue number of the reported bug or feature request: #

Describe your changes

• only check the node external IP or internal IP when determining host IP family. Otherwise there are unnecessary errors logged for things like hostname
• fix readme for the correct env variable for IPv6 (IP_FAMILIES)

Testing performed Describe the testing you have performed to ensure that the bug has been addressed, or that the new feature works as planned.

Additional context Add any other context about your contribution here.