Handle warnings

[tochi-y]

There are some warnings in the current 2.0.7 playbook. So it needs to handle them.

The warnings are:

• sudo

[DEPRECATION WARNING]: Instead of sudo/sudo_user, use become/become_user and make sure become_method is 'sudo' (default). This feature will be removed in version 2.9.
Deprecation warnings can be disabled by setting deprecation_warnings=False in ansible.cfg.

• restart_iptables.yml not found

[DEPRECATION WARNING]: Included file '/root/ansible/handlers/common/restart_iptables.yml' not found, however since this include is not explicitly marked as 'static:
yes', we will try and include it dynamically later. In the future, this will be an error unless 'static: no' is used on the include task. If you do not want missing
includes to be considered dynamic, use 'static: yes' on the include or set the global ansible.cfg options to make all includes static for tasks and/or handlers. This
feature will be removed in version 2.12. Deprecation warnings can be disabled by setting deprecation_warnings=False in ansible.cfg.

• old git version

 [WARNING]: Your git version is too old to fully support the depth argument. Falling back to full checkouts.

• Invoking "yum" only once while using a loop via squash_actions

[DEPRECATION WARNING]: Invoking "yum" only once while using a loop via squash_actions is deprecated. Instead of using a loop to supply multiple items and specifying
`pkg: "{{ item }}"`, please use `pkg: ['nfs-utils']` and remove the loop. This feature will be removed in version 2.11. Deprecation warnings can be disabled by setting
 deprecation_warnings=False in ansible.cfg.

• jinja2 templating delimiters

 [WARNING]: conditional statements should not include jinja2 templating delimiters such as {{ }} or {% %}. Found: "{{ disklabel }}" not in disk_label.stdout

• wget

 [WARNING]: Consider using the get_url or uri module rather than running 'wget'.  If you need to use command because get_url or uri is insufficient you can add 'warn:
false' to this command task or set 'command_warnings=False' in ansible.cfg to get rid of this message.

• /usr/bin/python

 [WARNING]: Platform linux on host 172.18.10.6 is using the discovered Python interpreter at /usr/bin/python, but future installation of another Python interpreter
could change this. See https://docs.ansible.com/ansible/2.8/reference_appendices/interpreter_discovery.html for more information.

• tar

 [WARNING]: Consider using the unarchive module rather than running 'tar'.  If you need to use command because unarchive is insufficient you can add 'warn: false' to
this command task or set 'command_warnings=False' in ansible.cfg to get rid of this message.