Fixes geerlingguy#53: Don't manage postfix in MySQL role.

Author: geerlingguy

tasks/setup-RedHat.yml

@@ -1,8 +1,4 @@
 ---
-- name: Update postfix to the latest version (if extra repositories enabled).
-  yum: "name=postfix state=latest enablerepo={{ mysql_enablerepo }}"
-  when: mysql_enablerepo != ""
-
 - name: Ensure MySQL packages are installed.
   yum: "name={{ item }} state=installed enablerepo={{ mysql_enablerepo }}"
   with_items: mysql_packages