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/queue.go

@@ -5,7 +5,6 @@ import (
 	"strconv"
 	"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"
@@ -71,7 +70,7 @@ func handleQueueItem(ctx context.Context, q workqueue.RateLimitingInterface, han
 
 	if err != nil {
 		// We've actually hit an error, so we set the span's status based on the error.
-		span.SetStatus(ocstatus.FromError(err))
+		span.SetStatus(err)
 		log.G(ctx).Error(err)
 		return true
 	}