veth: fix veth activation on booting
When creating one profile for each veth during activation the creation of the veth could fail. When the link for the first profile is created the link for the peer is generated in kernel. Therefore when trying to activate the second profile it will fail because the link already exists. NetworkManager must check if the link already exists and corresponds to the same veth, if so, it should skip the link creation.
https://bugzilla.redhat.com/show_bug.cgi?id=2036023 https://bugzilla.redhat.com/show_bug.cgi?id=2105956