Virtual Chassis "Domain" not searchable (Global Search)

[DanSheps]

Issue type

[ ] Feature request
[X ] Bug report
[ ] Documentation

Environment

• Python version: 3.5.4
• NetBox version: 2.3.3

Reproduction

• Create a virtual chassis with a domain
• Attempt to search the domain using the global search

Behaviour

Expected

Search returns the virtual chassis objects as well as the member objects

Actual

No objects returned

Description

In playing with the virtual chassis today, I discovered it is not possible to search by virtual chassis domain. This is something I would expect to be searchable like other elements of objects (serial, model, etc)

[DanSheps]

I am currently working on a PR for this as well