Update conditions for mysql settings in minion.conf

There was a wrong assumption that if galera.master or
galera.slave or mysql.server was defined in pillar we tried
to pick user/password from pillar.
This patch updates condition to ensure that enabled attribute
set to True.

Related-Prod: PROD-16658

Change-Id: I9cdd9259000d7fc648b41d7402dc8ffe9659955b
1 file changed