Use deployment watcher if there's a deploy ID

Previously levant would check the template contained an update stanza at
the job level, before watching for a service job deployment to complete.

With this change, we'll always wait for a deployment to complete. This
allows the Nomad server to be the one to determine if the template has a
"deployment" rather than levant.

levant/deploy.go

@@ -152,14 +152,6 @@ func (l *levantDeployment) deploy() (success bool) {
 
 	switch *l.config.Template.Job.Type {
 	case nomadStructs.JobTypeService:
-
-		// If the service job doesn't have an update stanza, the job will not use
-		// Nomad deployments.
-		if l.config.Template.Job.Update == nil {
-			log.Info().Msg("levant/deploy: job is not configured with update stanza, consider adding to use deployments")
-			return l.jobStatusChecker(&eval.EvalID)
-		}
-
 		log.Info().Msgf("levant/deploy: beginning deployment watcher for job")
 
 		// Get the deploymentID from the evaluationID so that we can watch the
@@ -170,6 +162,8 @@ func (l *levantDeployment) deploy() (success bool) {
 			return
 		}
 
+		log.Info().Msgf("levant/deploy: watching deployment %s for job", depID)
+
 		// Get the success of the deployment and return if we have success.
 		if success = l.deploymentWatcher(depID); success {
 			return