Add refresh

[raphink]

This adds refresh support to the puppet_certificate type, allowing certificates to be recreated when triggered by another resource.

An example of usage is to regenerate certificates when the csr_attributes.yaml file is modified:

    file { "${confdir}/puppet/csr_attributes.yaml":
      ensure  => file,
      owner   => 'root',
      group   => 'root',
      mode    => '0440',
      content => template('blah/csr_attributes.yaml.erb'),
    }
    ~> puppet_certificate { $certname:
      ensure               => present,
      waitforcert          => 60,
    }

[raphink]

@reidmv did you have a chance to look at this?

[reidmv]

@raphink Looking now. There's no description in the PR and no description in the commit message for what this is used for... Can you describe the use case? What is this for? Would be good to have that information in the commit message as well so our future selves have a reminder about why this change was made.

[raphink]

@reidmv added a description to the PR.

[reidmv]

@raphink awesome, thanks! Sorry I didn't see these PRs earlier.

I've merged this (and #4, and #5) in a work branch, made one change (safeguard the refresh functionality behind an onrefresh parameter), updated the README to reflect the changes, and then merged the entire work branch into master.

Can you take a look at the master branch and see if I managed to incorporate everything sanely? If it looks good let me know and I'll cut a new version/release.

Thanks for your work on this!!!

[raphink]

Thanks for merging @reidmv . I'll have to rebase my code on it and check that every thing is fine, but it looks good to me already.