(QE-725) Feature/ezbake utils

This adds an `Beaker::DSL::EZBakeUtils` module which I anticipate will be very useful for developers and QA team who need to quickly prototype new behavior or tests in software without dealing with pushing to `nexus.delivery.puppetlabs.net` or waiting for OS packages to finish being build by `packaging`

Currently there are no spec tests for the new behavior. I'd like some feedback on approaches to handle this.

This also addresses QE-683 which is required for install_ezbake_deps
Not sure exactly how what you're saying would be different from 
```
name, version_number, arch = host['platform'].split('-',3)
```

Unless you want the `name`, `version_number`, and `arch` to become instance attributes of each Platform object.