Resolve "Implement integration tests for RBAC"

Description

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

Related to #340

api/proto/gosdn/rbac/user.proto

@@ -89,7 +89,7 @@ message CreateUsersResponse {
 // GetUser
 message GetUserRequest {
     int64 timestamp = 1;
-    string name = 2 [(buf.validate.field).required = true];
+    string name = 2 [(buf.validate.field).required = true]; // TODO(faseid): reconsider if this is necessary as required, but id is not?
     string id = 3;
 }