Install latest version of mock by default

[kostyrev]

As a role's user,
I want it to install the latest available version of software by default
so that I wasn't forced to remove the old package manually and apply the role.

[CLAassistant]

All committers have accepted the CLA.

[uchida]

@kostyrevaa thank you for your contribution.
Use explicit version is appropriate and worth to merge.

However, I’m caring about tags in your request, --tags or --skip-tags are applied in a whole playbook and it’s hard to give consistent tag naming rule across ansible roles.
I prefer roles to be neutral with respect to tag naming, so I would like to avoid using tags inside ansible role.

[kostyrev]

Hi!
I've removed those tags.

[uchida]

Your request has merged, thanks @kostyrevaa.
version 0.1.2, includes this request, is available on ansible galaxy.

[uchida]

After merged this pull request, I realised that using mock_config instead of mock_config_init seems better.
However it may break backward compatibility, so I will release 0.2.0 later (changes only minor version because currently this role in moratorium, 0.x.x, for semantic versioning).