Add comments to TestAlluxioEngine_getInitUsersArgs in pkg\ddc\alluxio\utils_test.go

[lixuefeng026]

Which function do you want to add comments to?
TestAlluxioEngine_getInitUsersArgs in pkg\ddc\alluxio\utils_test.go.
What comments do you want to add?

// TestAlluxioEngine_getInitUsersArgs tests the user initialization parameters generation functionality of utils.GetInitUsersArgs
//
// Parameters:
// - t (*testing.T): Testing context object from Go test framework
//
// Returns:
// - No return value, reports test failures through t.Errorf