Update to new release of moby/ipvs

hack/pin-dependency.sh github.com/moby/ipvs v1.1.0

- go to a fixed tag for `vishvananda/netns`
- no more references to `pkg/errors`

Signed-off-by: Davanum Srinivas <davanum@gmail.com>

vendor/github.com/vishvananda/netns/doc.go

@@ -0,0 +1,9 @@
+// Package netns allows ultra-simple network namespace handling. NsHandles
+// can be retrieved and set. Note that the current namespace is thread
+// local so actions that set and reset namespaces should use LockOSThread
+// to make sure the namespace doesn't change due to a goroutine switch.
+// It is best to close NsHandles when you are done with them. This can be
+// accomplished via a `defer ns.Close()` on the handle. Changing namespaces
+// requires elevated privileges, so in most cases this code needs to be run
+// as root.
+package netns