Enable tracing ability for tiller

- High verbosity doesn't log all RPC calls. So now allow tracing
  to be enabled on a deployment.

Change-Id: I12fe2ee9d1685906fcbbb6a417e249b793e8861c

charts/tiller/templates/deployment-tiller.yaml

@@ -81,6 +81,9 @@ spec:
           - -logtostderr
           - -v
           - {{ .Values.conf.tiller.verbosity | quote }}
+{{- if .Values.conf.tiller.trace }}
+          - -trace
+{{- end }}
         ports:
         - containerPort: 44134
           name: tiller

charts/tiller/values.yaml

@@ -35,6 +35,7 @@ deployment:
 conf:
   tiller:
     verbosity: 5
+    trace: false
 
 manifests:
   deployment_tiller: true