Unit Test - qualifiedname.go

Add unit tests to validate methods under utils package which are defined in [qualifiedname.go](https://github.com/apache/incubator-openwhisk-wskdeploy/blob/master/utils/qualifiedname.go)

All unit tests should go in qualifiedname_test.go under [utils/](https://github.com/apache/incubator-openwhisk-wskdeploy/blob/master/utils)

```
func ParseQualifiedName(name string, defaultNamespace string) (QualifiedName, error) {
...
}
```

Start by reading utils/qualifiedname.go and the ParseQualifiedName signature, then add tests in utils/qualifiedname_test.go for the methods defined there. Done means the qualified-name behavior is covered by unit tests that pass for the utils package.

Written by the indexing model from the issue text.