Enable export and import of SDN configuration

resolves #269 (closed)

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.

controller/interfaces/networkelement/networkElement.go

@@ -16,6 +16,7 @@ import (
 type NetworkElement interface {
 	ID() uuid.UUID
 	GetModel() ygot.GoStruct
+	GetModelAsFilteredCopy() (ygot.GoStruct, error)
 	CreateModelCopy() (ygot.ValidatedGoStruct, error)
 	Transport() transport.Transport
 	Name() string