Remove usage of ocstatus package

This changes the tracing package to accept an error on SetStatus, which
is really what we always want anyway.
This also decouples the trace package from opencensus.

vkubelet/node.go

@@ -6,7 +6,6 @@ import (
 	"fmt"
 	"time"
 
-	"github.com/cpuguy83/strongerrors/status/ocstatus"
 	pkgerrors "github.com/pkg/errors"
 	"github.com/virtual-kubelet/virtual-kubelet/log"
 	"github.com/virtual-kubelet/virtual-kubelet/trace"
@@ -275,7 +274,7 @@ func (n *Node) handlePing(ctx context.Context) (retErr error) {
 	ctx, span := trace.StartSpan(ctx, "node.handlePing")
 	defer span.End()
 	defer func() {
-		span.SetStatus(ocstatus.FromError(retErr))
+		span.SetStatus(retErr)
 	}()
 
 	if err := n.p.Ping(ctx); err != nil {
@@ -367,7 +366,7 @@ func UpdateNodeLease(ctx context.Context, leases v1beta1.LeaseInterface, lease *
 			l, err = ensureLease(ctx, leases, lease)
 		}
 		if err != nil {
-			span.SetStatus(ocstatus.FromError(err))
+			span.SetStatus(err)
 			return nil, err
 		}
 		log.G(ctx).Debug("created new lease")
@@ -429,7 +428,7 @@ func UpdateNodeStatus(ctx context.Context, nodes v1.NodeInterface, n *corev1.Nod
 	ctx, span := trace.StartSpan(ctx, "UpdateNodeStatus")
 	defer func() {
 		span.End()
-		span.SetStatus(ocstatus.FromError(retErr))
+		span.SetStatus(retErr)
 	}()
 
 	var node *corev1.Node