Update pinned mysql version

During the update of mysql from 5.6 to 5.7 we need to change pinned
value in galera pillar and update dependencies

Related-Bug: PROD-36708
Change-Id: I5d8021eaf613230b7ce85d86c83a46ce4ed66cd8
(cherry picked from commit 7ef244635f25eb315315f2715aba18cb6f6771ef)
3 files changed