Export package parameters in the format needed for import

(I couldn't find an issue where this had already been discussed, I apologise if this is a duplicate or I'm creating noise)

My use case: copying parameters from one action to another
- when you add a database and refresh the package list, the parameters you want are on the wrong package and it's tedious to get them from one place to another
- when I wanted to test some changes to my openwhisk package without hurting what's already live, I wanted to copy the package - it's easy to redeploy but I needed the package parameters.

To get the parameters from a package, we do: `wsk package get [packagename] parameters` which outputs something like:

```json
ok: got package firstpackage, displaying field parameters
[
{
"key": "slackURL",
"value": "https://hooks.slack.com/blah/blah"
},
{
"key": "cloudantURL",
"value": "https://wibble-squeak-bluemix.cloudant.com"
},
{
"key": "dbname",
"value": "awesomedb"
}
]
```

To supply these parameters to another package (e.g. for testing, or allowing another team member to match my config) the format I want is:

```json
{
"slackURL": "https://hooks.slack.com/services/blah/blah",
"cloudantURL": "https://wibble-squeak-bluemix.cloudant.com",
"dbname": "awesomedb"
}
```

With the above in a file called `params.json` I can then to `wsk package create mypackage -P params.json`.

Would it be desirable to offer this format (ideally _without_ the extra verbose output as the first line as we have now) as an option? It's a small thing and I appreciate that patches are probably welcome, but is this a useful addition for anyone other than myself?