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/networkdomain/pnd.go

@@ -16,7 +16,7 @@ type NetworkDomain interface {
 	Destroy() error
 	AddSbi(s southbound.SouthboundInterface) error
 	RemoveSbi(uuid.UUID) error
-	AddNetworkElement(name string, opts *tpb.TransportOption, sid uuid.UUID) (uuid.UUID, error)
+	AddNetworkElement(name string, opts *tpb.TransportOption, sid uuid.UUID, networkElement uuid.UUID) (uuid.UUID, error)
 	GetNetworkElement(identifier string) (networkelement.NetworkElement, error)
 	RemoveNetworkElement(uuid.UUID) error
 	UpdateNetworkElement(networkelement.NetworkElement, string) error