Add the possibility to manage the package outside the module

[kibidouil]

Pull Request (PR) description

I need the possibility to fix the version of keepalived, so, like service_manage, I introduce package_manage to install keepalived from another puppet module.

This Pull Request (PR) fixes the following issues

n/a

[smortex]

LGTM!

Can you please combine your commits in a single one?

From your working directory:

git rebase -i origin/master # Interactively rewrite history

This will bring your editor. Keep the first line unchanged, and replace pick with squash for all subsequent lines. Save and quit, your editor will allow you to combine the commit messages in a single commit message.

Then push your updated branch:

git push -f            # Send the changes (-f is required because we re-wrote history)

[kibidouil]

Commits are merged into one commit.