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)
diff --git a/.kitchen.yml b/.kitchen.yml
index 6a1fb2b..e89aa68 100644
--- a/.kitchen.yml
+++ b/.kitchen.yml
@@ -36,6 +36,9 @@
           - repos_base
           - repos
           - galera
+          - repo_percona
+  pillars-from-files:
+    repo_percona.sls: tests/pillar/repo_percona.sls
 
 verifier:
   name: inspec