Remove mysql-client pinnings

Change-Id: I61cc1b6f73de7ffa2a82f5d78915f22fd98f6aec
Related-PROD: https://mirantis.jira.com/browse/PROD-15657
(cherry picked from commit b394833d2c1d43c255a376e30f964f97e73300c3)
diff --git a/classes/cluster/virtual-mcp11-aio/init.yml b/classes/cluster/virtual-mcp11-aio/init.yml
index 91e1974..a51ec65 100755
--- a/classes/cluster/virtual-mcp11-aio/init.yml
+++ b/classes/cluster/virtual-mcp11-aio/init.yml
@@ -58,10 +58,6 @@
           - pin: ${_param:linux_system_repo_pin}
             priority: ${_param:linux_system_repo_priority}
             package: '*'
-        # workaround for PROD-15657, mysql 5.7 isn't built, using 5.6 instead
-          - pin: 'version 5.6*'
-            priority: 1300
-            package: 'mysql-client'
     network:
       bridge: openvswitch
       interface: