ip: place veth peer in host namspace directly

Instead of moving the host side of the veth peer into the host
network namespace later, just create it in the host namespace
directly.

Signed-off-by: Dan Williams <dcbw@redhat.com>

pkg/ip/link_linux_test.go

@@ -188,8 +188,8 @@ var _ = Describe("Link", func() {
 			_ = containerNetNS.Do(func(ns.NetNS) error {
 				defer GinkgoRecover()
 				_, _, err := ip.SetupVeth(containerVethName, mtu, "", hostNetNS)
-				Expect(err.Error()).To(HavePrefix("failed to move veth to host netns: "))
-
+				Expect(err.Error()).To(HavePrefix("container veth name provided"))
+				Expect(err.Error()).To(HaveSuffix("already exists"))
 				return nil
 			})
 		})