Upgrade hcl to v2

Signed-off-by: Patrick Van Stee <patrick@vanstee.me>

vendor/github.com/zclconf/go-cty/cty/unknown_as_null.go

@@ -0,0 +1,64 @@
+package cty
+
+// UnknownAsNull returns a value of the same type as the given value but
+// with any unknown values (including nested values) replaced with null
+// values of the same type.
+//
+// This can be useful if a result is to be serialized in a format that can't
+// represent unknowns, such as JSON, as long as the caller does not need to
+// retain the unknown value information.
+func UnknownAsNull(val Value) Value {
+	ty := val.Type()
+	switch {
+	case val.IsNull():
+		return val
+	case !val.IsKnown():
+		return NullVal(ty)
+	case ty.IsListType() || ty.IsTupleType() || ty.IsSetType():
+		length := val.LengthInt()
+		if length == 0 {
+			// If there are no elements then we can't have unknowns
+			return val
+		}
+		vals := make([]Value, 0, length)
+		it := val.ElementIterator()
+		for it.Next() {
+			_, v := it.Element()
+			vals = append(vals, UnknownAsNull(v))
+		}
+		switch {
+		case ty.IsListType():
+			return ListVal(vals)
+		case ty.IsTupleType():
+			return TupleVal(vals)
+		default:
+			return SetVal(vals)
+		}
+	case ty.IsMapType() || ty.IsObjectType():
+		var length int
+		switch {
+		case ty.IsMapType():
+			length = val.LengthInt()
+		default:
+			length = len(val.Type().AttributeTypes())
+		}
+		if length == 0 {
+			// If there are no elements then we can't have unknowns
+			return val
+		}
+		vals := make(map[string]Value, length)
+		it := val.ElementIterator()
+		for it.Next() {
+			k, v := it.Element()
+			vals[k.AsString()] = UnknownAsNull(v)
+		}
+		switch {
+		case ty.IsMapType():
+			return MapVal(vals)
+		default:
+			return ObjectVal(vals)
+		}
+	}
+
+	return val
+}