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.

applications/venv-manager/venv-manager/venv-manager.go

@@ -31,16 +31,18 @@ type VenvManager struct {
 	dialConnectionURL    string
 	dialOption           grpc.DialOption
 	yamlFilepath         string
+	sdnConfigFilepath    string
 	containerRegistryURL string
 	pnd                  string
 }
 
 // NewVenvManager creates a new VenvManager to use.
-func NewVenvManager(dialConnectionURL string, dialOption grpc.DialOption, yamlFilepath string, containerRegistryURL string) *VenvManager {
+func NewVenvManager(dialConnectionURL string, dialOption grpc.DialOption, yamlFilepath string, sdnConfigFilepath string, containerRegistryURL string) *VenvManager {
 	v := new(VenvManager)
 	v.dialConnectionURL = dialConnectionURL
 	v.dialOption = dialOption
 	v.yamlFilepath = yamlFilepath
+	v.sdnConfigFilepath = sdnConfigFilepath
 	v.containerRegistryURL = containerRegistryURL
 	return v
 }
@@ -90,7 +92,10 @@ func (v *VenvManager) CreateSDNConfigFile() error {
 		return err
 	}
 
-	fmt.Println(sdnConfigReponse)
+	err = v.writeSDNConfigToFile(*sdnConfigReponse)
+	if err != nil {
+		return err
+	}
 
 	return nil
 }
@@ -123,6 +128,16 @@ func (v *VenvManager) getSDNConfigData() (*string, error) {
 	return &sdnConfigResponse.SdnConfig, nil
 }
 
+// writeSDNConfigToFile wriets the SDN configuration in a string to a file
+func (v *VenvManager) writeSDNConfigToFile(sdnConfigToWrite string) error {
+	err := os.WriteFile(v.sdnConfigFilepath, []byte(sdnConfigToWrite), 0644)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
 // CreateTopologyFile creates the topology file.
 func (v *VenvManager) CreateTopologyFile() error {
 	topologyData, err := v.getTopologyData()