added the tasks to remove the mysql 5.6 experimental

playbooks/roles/mysql/defaults/main.yml

 ---
+remove_experimental_mysql: false
+
 mysql_debian_pkgs:
   - "mysql-server-5.6"
   - python-mysqldb

playbooks/roles/mysql/tasks/main.yml

@@ -6,8 +6,11 @@
   changed_when: no
 
 - fail:
-    msg: "You have already installed the experimental MySQL 5.6 repo, Please first remove that"
-  when: "'5.6.14' in  mysql_56_installed.stdout"
+    msg: "MySQL experimental is already installed, make remove_experimental_mysql: true in defaults/main.yml, if you want to remove it"
+  when: "'5.6.14' in  mysql_56_installed.stdout and not remove_experimental_mysql"
+
+- include: remove_mysql_experimental.yml
+  when: remove_experimental_mysql
 
 - include: mysql.yml
-  when: mysql_56_installed.rc == 1
\ No newline at end of file
+  when: (mysql_56_installed.rc == 1) or (remove_experimental_mysql)
\ No newline at end of file

playbooks/roles/mysql/tasks/mysql.yml

 ---
+# Here are the few steps that I have performed to get the `debconf` setting information:
+#
+# - downloaded the mysql-apt-repo from the mysql official site(named: mysql-apt-config_0.6.0-1_all.deb)
+# - Find the `debconf` setting information after installing this `deb` package
+# 
+# # debconf-show mysql-apt-config
+# * mysql-apt-config/select-server: mysql-5.6
+#   mysql-apt-config/unsupported-platform: abort
+#   mysql-apt-config/repo-codename: precise
+# * mysql-apt-config/select-product: Apply
+#   mysql-apt-config/select-tools:
+#   mysql-apt-config/repo-distro: ubuntu
+# 
+# - Even to get more information about the `debconf` options of the package:
+# 
+# # debconf-get-selections|grep mysql-apt-config
+# mysql-apt-config  mysql-apt-config/select-server  select  mysql-5.6
+# mysql-apt-config  mysql-apt-config/unsupported-platform select  abort
+# mysql-apt-config  mysql-apt-config/repo-codename  select  precise
+# mysql-apt-config  mysql-apt-config/select-product select  Apply
+# mysql-apt-config  mysql-apt-config/select-tools select
+# mysql-apt-config  mysql-apt-config/repo-distro  select  ubuntu
+# 
+# - After the installation, I have checked the `/etc/apt/sources.list.d` directory and found one file `mysql.list` 
+# with following contents:
+# 
+# deb http://repo.mysql.com/apt/ubuntu/ precise mysql-apt-config
+# deb http://repo.mysql.com/apt/ubuntu/ precise mysql-5.6
+# deb-src http://repo.mysql.com/apt/ubuntu/ precise mysql-5.6
+# 
+#
+# Thought that instead of performing all those steps and get the repo, why not directly use this repo 
+# `deb http://repo.mysql.com/apt/ubuntu/ precise mysql-5.6`, I just picked this line and directly used it and it worked for us. 
+
 - name: Add MySQL community apt key
   apt_key:
     id: 8C718D3B5072E1F5

playbooks/roles/mysql/tasks/remove_mysql_experimental.yml

+---
+- name: Stop mysql service
+  service: 
+    name: mysql 
+    state: stopped
+ 
+- name: Remove experimental version of mysql
+  apt: 
+    name: "{{ item }}" 
+    state: absent 
+    purge: yes
+  with_items:
+    - mysql-server-5.6
+    - mysql-server
\ No newline at end of file