Allow strings into ssl cert fields

[Ultimation]

Affected Puppet, Ruby, OS and module versions/distributions

• Puppet: 4.5.2
• Ruby:
• Distribution: Centos 7.5
• Module version: puppet-rundeck (5.4.0)

How to reproduce (e.g Puppet code you use)

Provide string argument into ssl_certfile or ssl_keyfile

What are you seeing

Fails due it not being a file path

What behaviour did you expect instead

It to use the string provided instead of requiring the file to be present on the machine

Output log

Any additional information you'd like to impart

We store our private keys in hiera-eyaml, and would rather pass it into this module through that than create a file with it on the machine, and then pass that path into this module.

Alternatively, make these not fail the puppet run if not present.