Add tag "DataClassificationFed" with default value "Direct Impact"

[herman-wong-cf]

Add tag "DataClassificationFed" with default value "Direct Impact".

merge() is used to merge the tags:
https://developer.hashicorp.com/terraform/language/functions/merge

If more than one given map or object defines the same key or attribute, then the one that is later in the argument sequence takes precedence.

The precedence is as follows:

1. Tags defined in variable "global_tags"
2. Tags defined in variable "tags"
3. Statically defined tags in ec2.tf

If you don't define tags that override "DataClassificationFed", the default value will be used:

tags                                 = {
          + "App"                   = "Management"
          + "CNAME"                 = "mgtcorewbstn"
          + "DataClassificationFed" = "Direct Impact"
          + "Name"                  = "mgtcorewbstn"
          + "OSType"                = "Windows"
          + "PatchGroup"            = "1"
          + "Role"                  = "windowsbastion"
          + "Schedule"              = "DefaultOfficeHours"
          + "managed_by"            = "terraform"
        }

If you DO define a "tags" variable with a value to "DataClassificationFed":

tags                                 = {
          + "App"                   = "Management"
          + "CNAME"                 = "mgtcorewbstn"
          + "DataClassificationFed" = "Federal data"
          + "Name"                  = "mgtcorewbstn"
          + "OSType"                = "Windows"
          + "PatchGroup"            = "1"
          + "Role"                  = "windowsbastion"
          + "Schedule"              = "DefaultOfficeHours"
          + "managed_by"            = "terraform"
        }

[herman-wong-cf]

This addresses #27

[az-kennedy]

Checking with the OC team on this one. We need guidance on using resource tags or doing global provider tags

[herman-wong-cf]

Spoke with Thomas Kennedy, this will be set via the aws provider default_tags.