Upgrade hcl to v2

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

vendor/github.com/zclconf/go-cty/cty/convert/conversion_capsule.go

@@ -0,0 +1,31 @@
+package convert
+
+import (
+	"github.com/zclconf/go-cty/cty"
+)
+
+func conversionToCapsule(inTy, outTy cty.Type, fn func(inTy cty.Type) func(cty.Value, cty.Path) (interface{}, error)) conversion {
+	rawConv := fn(inTy)
+	if rawConv == nil {
+		return nil
+	}
+
+	return func(in cty.Value, path cty.Path) (cty.Value, error) {
+		rawV, err := rawConv(in, path)
+		if err != nil {
+			return cty.NilVal, err
+		}
+		return cty.CapsuleVal(outTy, rawV), nil
+	}
+}
+
+func conversionFromCapsule(inTy, outTy cty.Type, fn func(outTy cty.Type) func(interface{}, cty.Path) (cty.Value, error)) conversion {
+	rawConv := fn(outTy)
+	if rawConv == nil {
+		return nil
+	}
+
+	return func(in cty.Value, path cty.Path) (cty.Value, error) {
+		return rawConv(in.EncapsulatedValue(), path)
+	}
+}