- rename the `cos-container` suite of modules to `cloud-config-container`
- refactor the `onprem-in-a-box` module to only manage the `cloud-config` configuration, and make it part of the `cloud-config-container` suite of modules
- update the `onprem-google-access-dns` example to use the refactored `onprem` module
- fix the `external_addresses` output in the `compute-vm` module
- small tweaks and fixes to the `cloud-config-container` modules