indent: replace some tabs by spaces
catch the case update-rc.d failed

update-rc.d may fail if the init script has invalid LSB headers.
https://bugs.launchpad.net/galera/+bug/1263027
packages: ensure services are not enabled

The previous implementation was not checking if package
dependencies were deploying services.
By redirecting update-rc.d, we can do that globally.
openstack-full: install galera