Brocade NOS v4.1.3b - virtual chassis

https://p.libren.ms/view/c09cdc8f
https://p.libren.ms/view/51a104b1
https://p.libren.ms/view/b9845998

Adding additional information for when switch is in virtual chassis mode for “Brocade NOS v4.1.3b”

(Imported from https://github.com/librenms/librenms/issues/8775, Original request by: @MHammett)