Sets the MariaDB binary log expiration

Summary:
MariaDB can currently fill disk space with the binary log growth
without any restriction. After 40 weeks, more than 50 Gb were used.

Restrict the binary log to 2 weeks of entries.

References:

• https://mariadb.com/docs/server/ha-and-performance/standard-replication/replication-and-binary-log-system-variables

Fixes T2120.

Reviewers: DorianWinty

Reviewed By: DorianWinty

Maniphest Tasks: T2120

Differential Revision: https://devcentral.nasqueron.org/D3645