Update the version of CentOS to 7.2

[jvrplmlmn]

Resolves stackstorm/chef-stackstorm#10

[jvrplmlmn]

KitchenCI test seems to fail with this version of CentOS while trying to install a mongo-* package:

(...)
       Recipe: stackstorm::_mongodb
         * execute[mongodb-systemctl-daemon-reload] action run
           - execute systemctl daemon-reload
         * execute[mongodb-systemctl-daemon-reload] action run
           - execute systemctl daemon-reload
       Recipe: mongodb::install
         * yum_package[mongodb-server] action install
           * No candidate version available for mongodb-server
           ================================================================================

           Error executing action `install` on resource 'yum_package[mongodb-server]'
           ================================================================================

           Chef::Exceptions::Package
           -------------------------
           No candidate version available for mongodb-server

           Cookbook Trace:
           ---------------
           /tmp/kitchen/cache/cookbooks/compat_resource/files/lib/chef_compat/monkeypatches/chef/runner.rb:41:in `run_action'

           Resource Declaration:
           ---------------------
           # In /tmp/kitchen/cache/cookbooks/mongodb/recipes/install.rb

            77: package node[:mongodb][:package_name] do
            78:   options packager_opts
            79:   action :install
            80:   version node[:mongodb][:package_version]
            81: end
            82:

           Compiled Resource:

           ------------------
           # Declared in /tmp/kitchen/cache/cookbooks/mongodb/recipes/install.rb:77:in `from_file'

           yum_package("mongodb-server") do
             package_name "mongodb-server"
             action [:install]
             retries 0
             retry_delay 2
             default_guard_interpreter :default
             declared_type :package
             cookbook_name "mongodb"
             recipe_name "install"
             options "--nogpgcheck"
             flush_cache {:before=>false, :after=>false}
           end

           Platform:
           ---------
           x86_64-linux

       Recipe: stackstorm::_mongodb
         * service[mongod] action restart
           - restart service service[mongod]

       Running handlers:
       [2016-08-31T12:20:18+00:00] ERROR: Running exception handlers
       Running handlers complete
       [2016-08-31T12:20:18+00:00] ERROR: Exception handlers complete
       Chef Client failed. 38 resources updated in 07 minutes 30 seconds
       [2016-08-31T12:20:18+00:00] FATAL: Stacktrace dumped to /tmp/kitchen/cache/chef-stacktrace.out
       [2016-08-31T12:20:18+00:00] FATAL: Please provide the contents of the stacktrace.out file if you file a bug report
       [2016-08-31T12:20:18+00:00] ERROR: yum_package[mongodb-server] (mongodb::install line 77) had an error: Chef::Exceptions::Package: No candidate version available for mongodb-server
       [2016-08-31T12:20:24+00:00] FATAL: Chef::Exceptions::ChildConvergeError: Chef run process exited unsuccessfully (exit code 1)
>>>>>> ------Exception-------
>>>>>> Class: Kitchen::ActionFailed
>>>>>> Message: 1 actions failed.
>>>>>>     Converge failed on instance <default-centos-72>.  Please see .kitchen/logs/default-centos-72.log for more details
>>>>>> ----------------------
>>>>>> Please see .kitchen/logs/kitchen.log for more details
>>>>>> Also try running `kitchen diagnose --all` for configuration

There is no available mongo* package:

[vagrant@default-centos-72 ~]$ yum search mongo
Failed to set locale, defaulting to C
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirror.netcologne.de
 * extras: artfiles.org
 * updates: ftp.plusline.de
=========================================================================================================================================================================== N/S matched: mongo ===========================================================================================================================================================================
autocorr-mn.noarch : Mongolian auto-correction rules
hunspell-mn.noarch : Mongolian hunspell dictionaries
hyphen-mn.noarch : Mongolian hyphenation rules

  Name and summary matches only, use "search all" for everything.
[vagrant@default-centos-72 ~]$

Seems related with #8

[shortdudey123]

Thanks!