(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
This config stores the hash map that ezbake creates for the ephemeral git repository in its ezbake/target/staging directory, which only exists after the `stage` ezbake action has run. The template used to create this hash map can be seen here: https://github.com/puppetlabs/ezbake/blob/master/staging-templates/ezbake.rb.mustache

The `Beaker::DSL::EZBakeUtils.config` attribute is populated during the `ezbake_stage` method: https://github.com/waynr/beaker/blob/merged/lib/beaker/dsl/ezbake_utils.rb#L43