vrrp:  refactor test
vrrp:  refactor test

Move scapy packet generation code out of vpp object and into the test
case.

Type: test

Change-Id: Ib4de7409eefb79fc59f9815bed3befe5ecde483c
Signed-off-by: Paul Vinciguerra <b92f79aabe4c9c18085c7347110a52af0898a0ef@vinciconsulting.com>

FDio/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,FDio/vpp