feature: 1. ak/sk auth support 2. a full feature s3gateway works with

Cyberduck

注意：以下两个文件的修改还未被官方合并，所以下次make
mod的时候会被覆盖，需要注意checkout恢复：

vendor/github.com/Azure/azure-sdk-for-go/storage/blockblob.go
vendor/github.com/tencentyun/cos-go-sdk-v5/object_part.go

pkg/cloudcommon/policy/defaults.go

@@ -204,6 +204,36 @@ var (
 					Action:   PolicyActionDelete,
 					Result:   rbacutils.Allow,
 				},
+				{
+					Service:  "identity",
+					Resource: "credentials",
+					Action:   PolicyActionGet,
+					Result:   rbacutils.Allow,
+				},
+				{
+					Service:  "identity",
+					Resource: "credentials",
+					Action:   PolicyActionList,
+					Result:   rbacutils.Allow,
+				},
+				{
+					Service:  "identity",
+					Resource: "credentials",
+					Action:   PolicyActionCreate,
+					Result:   rbacutils.Allow,
+				},
+				{
+					Service:  "identity",
+					Resource: "credentials",
+					Action:   PolicyActionUpdate,
+					Result:   rbacutils.Allow,
+				},
+				{
+					Service:  "identity",
+					Resource: "credentials",
+					Action:   PolicyActionDelete,
+					Result:   rbacutils.Allow,
+				},
 				{
 					Service:  "yunionconf",
 					Resource: "parameters",