netlink: fix veth already present as ovs interface
netlink: fix veth already present as ovs interface

metadata needs to be up to date before processing
veth peering. In case of veth present as ovs interface,
ovs could have been registered the interface before netlink.
In that specific case metadata used for the veth processing
was those filled by ovs, so without PeerIfIndex.

This patch ensures that metadata are updated before veth
processing.

Change-Id: I1bc349d87a40934a717cf16ce2c8e4fcd4aad038
Reviewed-on: https://softwarefactory-project.io/r/5984
Reviewed-by: Sylvain Baubeau <b0a7dc08a3f38d713e107103b0a85b0badc14b84@redhat.com>
Tested-by: Sylvain Baubeau <b0a7dc08a3f38d713e107103b0a85b0badc14b84@redhat.com>
Workflow: Sylvain Baubeau <b0a7dc08a3f38d713e107103b0a85b0badc14b84@redhat.com>
Tested-by: Jenkins CI <d95b56ce41a2e1ac4cecdd398defd7414407cc08@softwarefactory-project.io>

safchain/skydive,skydive-project/skydive,safchain/skydive,safchain/skydive,lebauce/skydive,skydive-project/skydive,lebauce/skydive,redhat-cip/skydive,lebauce/skydive,lebauce/skydive,redhat-cip/skydive,lebauce/skydive,skydive-project/skydive,safchain/skydive,safchain/skydive,redhat-cip/skydive,skydive-project/skydive,lebauce/skydive,safchain/skydive,skydive-project/skydive,safchain/skydive,lebauce/skydive,skydive-project/skydive,skydive-project/skydive,safchain/skydive,lebauce/skydive