cleanup: Remove Opentracing support as no active users (#2196)

References:
[1] #2193
[2] https://fissionio.slack.com/archives/C3LUX6BBP/p1631706812069300

Signed-off-by: Sanket Sudake <sanketsudake@gmail.com>

pkg/executor/executor.go

@@ -253,7 +253,7 @@ func (executor *Executor) getFunctionServiceFromCache(ctx context.Context, fn *f
 
 // StartExecutor Starts executor and the executor components such as Poolmgr,
 // deploymgr and potential future executor types
-func StartExecutor(ctx context.Context, logger *zap.Logger, functionNamespace string, envBuilderNamespace string, port int, openTracingEnabled bool) error {
+func StartExecutor(ctx context.Context, logger *zap.Logger, functionNamespace string, envBuilderNamespace string, port int) error {
 	fissionClient, kubernetesClient, _, metricsClient, err := crd.MakeFissionClient()
 	if err != nil {
 		return errors.Wrap(err, "failed to get kubernetes client")
@@ -383,7 +383,7 @@ func StartExecutor(ctx context.Context, logger *zap.Logger, functionNamespace st
 	}
 	go reaper.CleanupRoleBindings(ctx, logger, kubernetesClient, fissionClient, functionNamespace, envBuilderNamespace, time.Minute*30)
 	go metrics.ServeMetrics(ctx, logger)
-	go api.Serve(ctx, port, openTracingEnabled)
+	go api.Serve(ctx, port)
 
 	return nil
 }