[WIP] Rework Role Structure

[dereknola]

Changes

Attempted to reconcile the current Roles with recommendations from Redhat

• Flatten roles, K3s_Agent and K3s_Server
• Add defaults for Update and Prereq roles, removed default assignment tasks
• Incorporate Original Download Role, which becaome a stub of 2 tasks, into the Agent and Server tasks
• Covert Download Role to Airgap role, Its what the Download role was doing 90% of the tasks anyways
• Remove gather_facts where possible, slightly improves performance