Allow search of virtual-chassis using name or master

[FragmentedPacket]

Environment

• Python version: 3.6
• NetBox version: 2.9/2.10

Proposed Functionality

Allow users to GET /api/dcim/virtual-chassis using name or master.

Use Case

Since name is a required parameter, it would be nice to be able to search for the exact name or even master as well.

This would help find a VC that is more unique rather than falling back to the default q search.

https://github.com/netbox-community/netbox/blob/develop/netbox/dcim/filters.py#L1014

I can own the implementation as I spoke with @lampwins and he advised me where to look for the filtering.

[jeremystretch]

Please be sure to extend the filterset tests appropriately as well.