default route isn't removed from ASIC DB

[pavel-shirshov]

root@str-s-acs-1:/# ip route show
default via 10.3.146.1 dev eth0  proto zebra 

127.0.0.1:6379> keys ROUTE_TABLE*
1) "ROUTE_TABLE:0.0.0.0/0"
2) "ROUTE_TABLE:10.0.0.8/31"
3) "ROUTE_TABLE:fc00::18/126"
4) "ROUTE_TABLE:fc00::8/126"
5) "ROUTE_TABLE:10.0.0.12/31"
6) "ROUTE_TABLE:10.0.0.4/31"
7) "ROUTE_TABLE:fc00::10/126"
8) "ROUTE_TABLE:fc00::/126"
9) "ROUTE_TABLE:10.0.0.0/31"

127.0.0.1:6379> hgetall ROUTE_TABLE:0.0.0.0/0
1) "nexthop"
2) "10.3.146.1"
3) "ifname"
4) "eth0"

127.0.0.1:6379[1]> hgetall "ASIC_STATE:SAI_OBJECT_TYPE_ROUTE_ENTRY:{\"dest\":\"0.0.0.0/0\",\"vr\":\"oid:0x3000000000002\"}"
1) "SAI_ROUTE_ATTR_PACKET_ACTION"
2) "SAI_PACKET_ACTION_FORWARD"
3) "SAI_ROUTE_ATTR_NEXT_HOP_ID"
4) "oid:0x5000000000ade"