Inconsistency between action and package list actions with invalid namespace

## Environment details:

* local deployment, running OpenWhisk in Minishift according to https://github.com/apache/incubator-openwhisk-deploy-openshift

## Steps to reproduce the issue:

1. List actions with an invalid namespace/package:
```
wsk action list /whisk.syssstem/utils
```
2. List packages with an invalid namespace:
```
wsk package list /whisk.systsdf
```

## Provide the expected results and outputs:

I'd expect both of the commands would return a message saying that the respective namespace or package doesn't exist.

## Provide the actual results and outputs:

The output of wsk action list is
```
error: Unable to obtain the list of actions for namespace 'whisk.syssstem': The supplied authentication is not authorized to access 'whisk.syssstem/utils'. (code 1119)
Run 'wsk --help' for usage.
```
The output of wsk package list is
```
packages
```

Additional thoughts
* returning an empty result in the second case might be misleading, I'd probably want to know that I'm entering an invalid/non-existent package