wsk trigger get shows underlying activationId

`wsk trigger get ` shows an underlying activationId.

```
wsk trigger get myCloudantTrigger

{
"activationId": "289ad83fef834a839ad83fef834a8379",
"annotations": [
{
"key": "limits",
"value": {
"concurrency": 1,
"logs": 10,
"memory": 256,
"timeout": 90000
}
},
{
...
...
```

The same activationId also gets logged in the logs which I see with the poll command.

```
Activation: 'changes' (289ad83fef834a839ad83fef834a8379)
[]
```

May be related to https://github.com/apache/incubator-openwhisk-cli/issues/134.

Comments from @rabbah on slack
```
this is bad formatting from the cli as it’s shown - the underlying activation should not be visible to you

there is an API call made via an action that’s invoked on your behalf to retrieve information about the feed
```

Riproduci il problema con `wsk trigger get ` e il comando poll usando l'output di esempio come riferimento. Traccia il modo in cui la CLI formatta le risposte del trigger e del poll, quindi verifica che l'activationId sottostante non sia più esposto in nessuno dei due output.

Scritto dal modello di indicizzazione a partire dal testo della issue.