Upgrade hcl to v2

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

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

@@ -0,0 +1,76 @@
+package convert
+
+import (
+	"github.com/zclconf/go-cty/cty"
+)
+
+// conversionObjectToObject returns a conversion that will make the input
+// object type conform to the output object type, if possible.
+//
+// Conversion is possible only if the output type is a subset of the input
+// type, meaning that each attribute of the output type has a corresponding
+// attribute in the input type where a recursive conversion is available.
+//
+// Shallow object conversions work the same for both safe and unsafe modes,
+// but the safety flag is passed on to recursive conversions and may thus
+// limit the above definition of "subset".
+func conversionObjectToObject(in, out cty.Type, unsafe bool) conversion {
+	inAtys := in.AttributeTypes()
+	outAtys := out.AttributeTypes()
+	attrConvs := make(map[string]conversion)
+
+	for name, outAty := range outAtys {
+		inAty, exists := inAtys[name]
+		if !exists {
+			// No conversion is available, then.
+			return nil
+		}
+
+		if inAty.Equals(outAty) {
+			// No conversion needed, but we'll still record the attribute
+			// in our map for later reference.
+			attrConvs[name] = nil
+			continue
+		}
+
+		attrConvs[name] = getConversion(inAty, outAty, unsafe)
+		if attrConvs[name] == nil {
+			// If a recursive conversion isn't available, then our top-level
+			// configuration is impossible too.
+			return nil
+		}
+	}
+
+	// If we get here then a conversion is possible, using the attribute
+	// conversions given in attrConvs.
+	return func(val cty.Value, path cty.Path) (cty.Value, error) {
+		attrVals := make(map[string]cty.Value, len(attrConvs))
+		path = append(path, nil)
+		pathStep := &path[len(path)-1]
+
+		for it := val.ElementIterator(); it.Next(); {
+			nameVal, val := it.Element()
+			var err error
+
+			name := nameVal.AsString()
+			*pathStep = cty.GetAttrStep{
+				Name: name,
+			}
+
+			conv, exists := attrConvs[name]
+			if !exists {
+				continue
+			}
+			if conv != nil {
+				val, err = conv(val, path)
+				if err != nil {
+					return cty.NilVal, err
+				}
+			}
+
+			attrVals[name] = val
+		}
+
+		return cty.ObjectVal(attrVals), nil
+	}
+}