(MODULES-10432) Add mod_auth_openidc support

[asieraguado]

Adds mod_auth_openidc and the parameters auth_oidc, oidc_settings to enable OpenID Connect authentication and authorization for a vhost.

[traylenator]

@asieraguado create a ticket in https://tickets.puppetlabs.com/projects/MODULES and link to this.

Generally this seems good to me.

[asieraguado]

Ticket created.
https://tickets.puppetlabs.com/browse/MODULES-10432

[sheenaajay]

Thank you @asieraguado for your contribution. The changes and unit test cases look good. It will be great if you can add some acceptance test to verify the changes.

[asieraguado]

Thank you @sheenaajay for your review. I included an acceptance test in vhost_spec.rb that verifies auth_oidc and its settings. There is one CI test failing for Ubuntu 14.04, but the same test should pass for Ubuntu 16.04 - the required package is available at least since this version [1].

[1] https://packages.ubuntu.com/xenial/web/libapache2-mod-auth-openidc

[traylenator]

@sheenaajay ubuntu 14.04 is EOL. Can it be removed as a test target?

[nilsjh]

Thanks, we're eagerly waiting for this fix to be merged. 👍

[ekohl]

For now you can skip that os in the acceptance test. I'd also like to see this merged :)

[michaeltlombardi]

Hey, @asieraguado, thanks for your contribution!

I think the skip is perfectly fine so long as the reason it fails on 14.04 is because it's not implemented.

[asieraguado]

Thank you, applied the change to skip Ubuntu 14.04 in the test.

[michaeltlombardi]

Awesome, time to merge!