According to https://bugzilla.redhat.com/show_bug.cgi?id=1916329, PCD will provide a new file in rhosp-release, describing the following needed information:
- RHEL Version
- Specific modules streams (the ones that aren't the default, such as container-tools).

The goal of the validation is to:
- ensure we're running on the correct RHEL release
- ensure the listed modules are on the right stream.

In case of any failure, the validation should display useful information, such as the CLI to call in order to correct the situation.

The Depends BZ refers to another modification of tripleo-validations in order to add rhosp-release as a new dependency. This will allow the Operator to run the validation beforehand, even before they install the whole tripleoclient and its dependencies.