[AAP-65882] Switch to DAB Redis cache backend
Replace awx.main.cache.AWXRedisCache with the equivalent
ansible_base.lib.cache.redis_cache.DABRedisCache and remove the
now-redundant AWX driver. The DAB driver was migrated from this
exact code and provides the same fault-tolerant cache behavior.
Signed-off-by: Tomas Z <tznamena@redhat.com>
