netlink: fix veth having exact same name/index
netlink: fix veth having exact same name/index

Do two pass for the peer lookup. The first is made
in the local namespace the second one in the whole
graph. This fixes issue when having exact same
name/index in two namespaces.

Change-Id: Iaa9bc9bf356e69ce5da8a3a1064774b2b68d3883
Reviewed-on: https://softwarefactory-project.io/r/6764
Reviewed-by: Nicolas PLANEL <2ba60255afd05ede961f6b959482fc724759f990@redhat.com>
Reviewed-by: Masco Kaliyamoorthy <75e2683cfc94863ef78c25b1a3fd996b311a68bc@redhat.com>
Workflow: Masco Kaliyamoorthy <75e2683cfc94863ef78c25b1a3fd996b311a68bc@redhat.com>
Tested-by: Jenkins CI <d95b56ce41a2e1ac4cecdd398defd7414407cc08@softwarefactory-project.io>

skydive-project/skydive,lebauce/skydive,safchain/skydive,safchain/skydive,safchain/skydive,safchain/skydive,skydive-project/skydive,skydive-project/skydive,safchain/skydive,safchain/skydive,skydive-project/skydive,lebauce/skydive,lebauce/skydive,skydive-project/skydive,safchain/skydive,lebauce/skydive,skydive-project/skydive,lebauce/skydive,safchain/skydive,skydive-project/skydive,lebauce/skydive,lebauce/skydive,lebauce/skydive