zebra: delete kernel routes using an interface with no more IPv4 address

When the last IPv4 address of an interface is deleted, Linux removes
all routes using this interface without any Netlink advertisement.

Routes that have a IPv4 nexthop are correctly removed from the FRR RIB.
However, routes that only have an interface with no more IPv4 addresses
as a nexthop remains in the FRR RIB.

In this situation, among the routes that this particular interface
nexthop:
 - remove from the zebra kernel routes
 - reinstall the routes that have been added from FRR. It is useful when
   the nexthop is for example a VRF interface.

Add related test cases in the zebra_netlink topotest.

Signed-off-by: Louis Scalbert <louis.scalbert@6wind.com>

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