rulebricks v1.7.0

Switch to vendored bitnami/kafka equivalent, Kafka resource and GC tuning, raise minimum resource requirements of small (Development) tier.

Changelog

Others

• 8a96d57: config cosmetics (@gsidsid)
• 15e0344: simplify tier language (@gsidsid)
• eb17057: vendor bitnami kafka + gc tuning (@gsidsid)