zebra: remove vrf route entries at vrf disabling

This is the continuation of the previous commit.

When a VRF is deleted, the kernel retains only its own routing entries
in the former VRF table and removes all others.

This change ensures that routing entries created by FRR daemons are also
removed from the former zebra VRF table when the VRF is disabled.

To test:

> echo "100 my_table" | tee -a /etc/iproute2/rt_tables
> ip l add du0 type dummy
> ifconfig du0 192.168.0.1/24 up
> ip route add blackhole default table 100
> ip route show table 100
> ip l add red type vrf table 100
> ip l set du0 master red
> vtysh -c 'configure' -c 'vrf red' -c 'ip route 10.0.0.0/24 192.168.0.254'
> vtysh -c 'show ip route table 100'
> sleep 0.1
> ip l del red
> sleep 0.1
> vtysh -c 'show ip route table 100'
> ip l add red type vrf table 100
> ip l set du0 master red
> vtysh -c 'configure' -c 'vrf red' -c 'ip route 10.0.0.0/24 192.168.0.254'
> vtysh -c 'show ip route table 100'
> sleep 0.1
> ip l del red
> sleep 0.1
> vtysh -c 'show ip route table 100'

Fixes: d8612e6 ("zebra: Track tables allocated by vrf and cleanup")
Signed-off-by: Louis Scalbert <louis.scalbert@6wind.com>

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