Let user set a name for a device or autogenerate it

Description

Let user set a name for a device or autogenerate it.

Related Issue

#100 (closed)

Motivation and Context

Users should have the chance to interact with human readable device names instead of UUIDs only.

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.

nucleus/principalNetworkDomain.go

@@ -317,6 +317,9 @@ func (pnd *pndImplementation) ChangeOND(uuid uuid.UUID, operation interface{}, p
 	}
 	cpy, err := ygot.DeepCopy(d.GoStruct)
 	ygot.BuildEmptyTree(cpy)
+	if err != nil {
+		return err
+	}
 
 	p, err := ygot.StringToStructuredPath(path)
 	if err != nil {