Unit Test - dependencies.go

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

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

```
// determine whether a location has a package feed
func LocationIsBinding(location string) bool {
...
}

// determine whether a location is set to GitHub repo
func LocationIsGithub(location string) bool {
...
}
```