zebra, ifp: on netlink discovery, anticipate the vrf creation

there may be cases where the vrf is yet allocated from the vty, and the
discovery process did not make the relationship between the vrf_id and
the name of the vrf. For instance, by parsing an interface belonging to
vrf-id X, it is not sure that vrf-id X and vrfname XX are talking about
the same vrf. For that, lets allocate the vrf, and lets try to detect
there is a duplicate case in vrf, so that the merge can be done without
any impact for the user.

Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>

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