* hcl2template/addrs.ParseRef will parse a reference and tell for example if we
are referring to a variable and its name, for now it can only do that and in
the future it improved when we need to most of it is from the TF code. This
is used to tell wether a variable vas referenced in a variable validation
condition; for now.
* Added Validations blocks to the hcl2 Variable struct and code to
parse/validate that.
* respect the destroy flag in content library config
* Make vsphere-clone respect delete_vm state tag; use a common delete func to prevent future drift
* add the possibility to set the packer.required_version field; to make sure the template file works with that version of Packer
* add tests
* add documentation on packer.required_version
Example:
packer {
required_version = ">= 1.2.0, < 2.0.0"
}
Previously (prior to v1.6.2) the Azure ARM builder had two delete functions
one that would run before any of the StepDelete* types, and one on deployment template
cleanup. The refactored coded re-introduces the logic from the previously removed
step in v1.6.1 as the main delete logic for the whole deployment
template. Ensuring that all deployed items are deleted before trying to
remove any managed disks.
This change moves all the deletion logic into the
step_deployment_template#Cleanup function to ensure that dependent steps
are only called once the created deployment items (i.e
StepDelateAdditionalDisks) have been deleted.
Test results before change
```
compute.DisksClient#Delete: Failure sending request: StatusCode=0 -- Original Error: autorest/azure: Service returned an error. Status=<nil> Code="OperationNotAllowed" Message="Disk pkrdd02e9rzzu5k-1 is attached to VM /subscriptions/1f90521a-24f6-4758-ac3d-88d869fb0bf5/resourceGroups/packer-acceptance-test/providers/Microsoft.Compute/virtualMachines/pkrvm02e9rzzu5k."
--- FAIL: TestBuilderAcc_ManagedDisk_Windows_Build_Resource_Group_Additional_Disk (454.00s)
FAIL
FAIL github.com/hashicorp/packer/builder/azure/arm 454.008s
```
Test results after change
```
--- PASS: TestBuilderAcc_ManagedDisk_Windows_Build_Resource_Group_Additional_Disk (563.56s)
```
Closes#10070
