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/device.go

@@ -6,6 +6,18 @@ import (
 	"github.com/openconfig/ygot/ygot"
 )
 
+type DeviceIdentifier interface {
+	IsDeviceIdentifier()
+}
+
+type StringIdentifier string
+
+func (si StringIdentifier) IsDeviceIdentifier() {}
+
+type UUIDIdentifier uuid.UUID
+
+func (ui UUIDIdentifier) IsDeviceIdentifier() {}
+
 // Device represents an Orchestrated Network Device (OND) which is managed by
 // nucleus
 type Device struct {