(WIP) Allow undeclared vars

[Stretch96]

• Terraform 0.12.0-alpha no longer allows assignments in terraform.tfvars without a corresponding variable declaration #19424

This adds the flag -allow-undeclared-vars which skips the parsing of
variables, which would otherwise generate an Error/Warning when a -var
is passed to apply/plan without being defined in a variable block

Without flag:

$ terraform plan -var foo=bar
Error: Value for undeclared variable

A variable named "foo" was assigned on the command line, but the root module
does not declare a variable of that name. To use this value, add a "variable"
block to the configuration.

With flag:

$ terraform apply -var foo=bar -allow-undeclared-vars

Refreshing Terraform state in-memory prior to plan...
...

[hashicorp-cla]

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