[K8s] Build 4.0.0.0-3041: Removal of member from loadbalacer pool leaving junk entry in nh --get output

Steps to reproduce
--------------------
1. Create Service in kubernets pointing to replication controller(rc) of 3 members.
So Service has 3 backends. ECMP composite nexthop for Service IP pointing to 3 entry.

2. Change the replica count in rc to higher value . Say 100
Service has 100 backends. ECMP composite nexthop for Service IP pointing to 100 entry.

3. Bring back replica value to 3.
Here all the 97 composite nexthop is removed and replaced with -1 entry. and "vRouter(Response): No such device " log is coming

root@kube-system-2(agent):/# rt --dump 1 | grep 10.100.51.120| more
10.100.51.120/32 32 P - 420 -
root@kube-system-2(agent):/# nh --get 420
Id:420 Type:Composite Fmly: AF_INET Rid:0 Ref_cnt:3 Vrf:1
              Flags:Valid, Policy, Ecmp, Etree Root,
              Valid Hash Key Parameters: Proto,SrcIP,SrcPort,DstIp,DstPort
              Sub NH(label): 19(20) 27(21) 23(19) -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
                             -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
                             -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
                             -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
                             -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1

Id:19 Type:Encap Fmly: AF_INET Rid:0 Ref_cnt:3 Vrf:1
              Flags:Valid, Etree Root,
              EncapFmly:0806 Oif:5 Len:14
              Encap Data: 02 92 7b 93 ea fa 00 00 5e 00 01 00 08 00

Id:27 Type:Encap Fmly: AF_INET Rid:0 Ref_cnt:3 Vrf:1
              Flags:Valid, Etree Root,
              EncapFmly:0806 Oif:7 Len:14
              Encap Data: 02 92 fd 13 70 fa 00 00 5e 00 01 00 08 00

Id:23 Type:Encap Fmly: AF_INET Rid:0 Ref_cnt:3 Vrf:1
              Flags:Valid, Etree Root,
              EncapFmly:0806 Oif:6 Len:14
              Encap Data: 02 92 b2 0e 20 fa 00 00 5e 00 01 00 08 00

vRouter(Response): No such device (19)
vRouter(Response): No such device (19)
vRouter(Response): No such device (19)
vRouter(Response): No such device (19)
vRouter(Response): No such device (19)
vRouter(Response): No such device (19)