Resolve "Containerised Southbound Interfaces and the corresponding device config representation within the controller"

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.

Closes #159 (closed)

api/grpc.go

@@ -124,6 +124,20 @@ func GetPnds(addr string, args ...string) (*pb.GetPndListResponse, error) {
 	return coreClient.GetPndList(ctx, req)
 }
 
+// deletePnd requests a deletion of the provided PND.
+func deletePnd(addr string, pid string) (*pb.DeletePndResponse, error) {
+	coreClient, err := nbi.CoreClient(addr, dialOptions...)
+	if err != nil {
+		return nil, err
+	}
+	ctx := context.Background()
+	req := &pb.DeletePndRequest{
+		Timestamp: time.Now().UnixNano(),
+		Pid:       pid,
+	}
+	return coreClient.DeletePnd(ctx, req)
+}
+
 // getChanges requests all pending and unconfirmed changes from the controller
 func getChanges(addr, pnd string) (*ppb.GetChangeListResponse, error) {
 	ctx := context.Background()