Add basic support for mod_proxy_ajp

[croddy]

This adds basic support for mod_proxy_ajp so that it can be enabled in the same manner as other commonly-used Apache modules. mod_proxy_ajp is part of the base Apache module install on both Red Hat- and Debian-type systems so this should be all that is required.

[igalic]

👍 from me

But this wouldn't be me, if I didn't have any remarks: Note with newer versions of Tomcat at least we generally recommend the use HTTP as protocol. No need to add a translation layer in between.

Could you perhaps also add an rspec test? (to spec/defines/)

[trlinkin]

👍

[hunner]

@igalic I think rspec tests for this simple of a class without a config file, package, special library path, or parameters, getting by without a test is okay (since the only thing we could test is it { should contain_apache__mod('proxy_ajp') } and that's just implementation; rspec-puppet can't currently test resource relationships). Thanks for the feedback and comments! They're really helpful :).

[croddy]

And I don't want to imply that I am endorsing designs based on mod_proxy_ajp... but that doesn't change the fact that there are still quite a few folks out there who need to puppetize existing Apache infrastructure that relies on this module.