Fix bug - dns_zone_id not available during planning

[tsaodown]

what

• dns_zone_id now accepts both string and list(string)

why

• When spinning up a new EB environment pointing at a Terraform-managed Route 53 hosted zone, an "Invalid Count Argument" error is thrown

references

• cloudposse/terraform-aws-elasticache-redis/main.tf#224 is the source of the fix

[hans-d]

/terratest

[mergify]

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