topotests: bgp_features, do not test inconsistent 'flags' value

After disabling the 'bgp suppress-no-fib' service, the test fails
to find the expected bgp route to '192.168.0.7': two paths are
available (from BGP and OSPF), and only the OSPF one is selected,
but the calculated recursive nexthop for BGP should not be installed.

Actually, in the FIB, the '192.168.0.7' prefix selected is the one
from OSPF.

In the test, the bgp nexthop-group functionality is turned on: The BGP
route for '192.168.0.7' uses a shared recursive nexthop which is
already installed. But because the BGP route has a bigger distance than
ospf, the BGP route is not installed.

Because the nexthop is shared and not self to the route, do ignore the
flags value of the nexthop, in this test.

Signed-off-by: Philippe Guibert <[email protected]>

tests/topotests/bgp_features/r1/ip_route.json

@@ -253,7 +253,6 @@
           "weight":1
         },
         {
-          "flags":1,
           "ip":"192.168.1.2",
           "afi":"ipv4",
           "interfaceName":"r1-eth1",