Add the test case to verify multiple routes with only specific nodes as next-hops

[vitthalmagadum]

Snippets from DVT:

Should be multuple routes with only SPN nodes as next-hops

DLFW1#show ip ro 192.168.100.3

VRF: default
Codes: C - connected, S - static, K - kernel,
O - OSPF, IA - OSPF inter area, E1 - OSPF external type 1,
E2 - OSPF external type 2, N1 - OSPF NSSA external type 1,
N2 - OSPF NSSA external type2, B - Other BGP Routes,
B I - iBGP, B E - eBGP, R - RIP, I L1 - IS-IS level 1,
I L2 - IS-IS level 2, O3 - OSPFv3, A B - BGP Aggregate,
A O - OSPF Summary, NG - Nexthop Group Static Route,
V - VXLAN Control Service, M - Martian,
DH - DHCP client installed default route,
DP - Dynamic Policy Route, L - VRF Leaked,
G - gRIBI, RC - Route Cache Route

B E $DLF_REMOTE_LOOPBACK0/32 [20/0] via $EBGP_NEI_IP, Ethernet1
via $EBGP_NEI_IP, Ethernet2
via $EBGP_NEI_IP, Ethernet3