Kolla assumes mariadb 10.0 where galera stuff was always enabled. And
this works for CentOS and Ubuntu as they use 10.0 on x86-64.
Debian uses mariadb 10.1 by default (and CentOS on !x86-64 and
Ubuntu/aarch64) where galera stuff is disabled by default.
Closes-Bug: 1740060
Co-Authored-By: Xinliang Liu <xinliang.liu@linaro.org>
Change-Id: I8374ac2219ad7880970cd789727d01af7cac1077