This MR depends on #74

Pull Request (PR) description

This moves all configuration from file_line/exec to a concat resources to be able to manage the config.toml file.

I've split this change in several commits with (hopefully) clear commit message. Hope that helps reviewing the change!

This Pull Request (PR) fixes the following issues

Fixes https://github.com/voxpupuli/puppet-gitlab_ci_runner/issues/18
Fixes https://github.com/voxpupuli/puppet-gitlab_ci_runner/issues/20

Pull Request (PR) description

the gitlab-runner package creates the config file with ownership root:root
and a restrictive permission mask of 077. the puppet module already manages
the file, althoug only its mere existence. this PR adds support for managing
the ownership and permissions of both the config file iteself and its parent directory.
both management options are optional and backwards compatible.

Fixed some typos on Readme, example usage code :

• tags-list -> tag-list
• Have set the correct absolute path gitlabcirunner::config_path: "/etc/gitlab-runner/config.toml"

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Pull Request (PR) description

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This Pull Request (PR) fixes the following issues

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Fixes #124
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