The checksums are not a defaults and are not meant to be changed from
the inventories.
Furthermore, role defaults have a lower priority that hosts facts, which
technically means a rogue hosts could hijack the hashes for its
variables.
dnsautoscaler should only be enabled when enable_dns_autoscaler is
set to true. without this, it could be enabled without any manifest
actually using it, which makes it a false signal.
Signed-off-by: Seena Fallah <seenafallah@gmail.com>