Resolve "Implement gNMI subscription management"

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 #382

controller/controller.go

@@ -360,6 +360,7 @@ func ensureAdminRoleExists() error {
 			"/gosdn.topology.TopologyService/UpdateLink",
 			"/gosdn.topology.TopologyService/DeleteLink",
 			"/gosdn.subscriptionmanagement.SubscriptionManagementService/ResetAllSubscriptions",
+			"/gosdn.subscriptionmanagement.SubscriptionManagementService/GetAll",
 		}))
 		if err != nil {
 			return err