ZT Gateway deployments

[jmolnar-zscaler]

FEATURES:

• New templates: base_ztgateway (greenfield/pov) and ztgateway (brownfield/production) enabling Zero Trust Gateway deployments
• ZSEC script support for ztgateway deployments

ENHANCEMENTS:

• Module Changes:
  • terraform-zscc-network-aws:
    • add variables exclude_igw and exclud_ngw supporting deployment configurations without requiring any NAT Gateway and/or Internet Gateway to be created or referenced such as Zero Trust Gateway topologies
    • add variable az_ids to explicitly set CC/ZT Gateway Availability Zones if letting templates create new subnets. Setting this will take precedence over var.az_count
    • add outputs zs_subnet_az_names, zs_subnet_az_ids, and zs_subnet_az_cidrs
    • general code refactoring and cleanup
  • terraform-zscc-gwlbendpoint-aws:
    • variable gwlb_arn made optional with default null value added supporting module use with byo endpoint service
  • terraform-zscc-workload-aws:
    • and output instance_id

[vkrishnamurthy-zscaler]

Looks good.