Remove '3' from Pulp installer and roles
The current installer and roles for Pulp 3 are tied to the pulp3 version disallowing flexibility for semantic versioning of Pulp and the installer going forward. I would recommend dropping the '3',e.g. `ansible-pulp` and `pulp` and `pulp-redis` for role names.
Further, current variables used inside the roles are not following best practices for variables being namespaced by the role name. Dropping the '3' would align these variables to best practices.
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