This patch changes name of Mariadb binary and relay log files. From now
they start with 'mariadb' instead of 'mysql'. Thanks to this fact
binary log names on a master and slaves have same name and we avoid
mess in data directory once we promote one of slaves to the master.
Change-Id: I18823b7a78e07b7999c937d068fb9cce9ed00285
Co-Authored-By: Kasper Hasior <k.hasior@samsung.com>