Add Amazon Provider for A2Mod

[ryandb]

The RedHat a2Mod provider is not used for Amazon. This adds a provider for it.

Possible fix for #121

[tmclaugh]

I don't agree this is a fix for the amazon issue I indicated. I suggested the module stop using mod.d and make the a2mod resource a NOOP for RHEL and Amazon. The puppet a2mod type is analogous to a2enmod and a2dismod on Debian which is used to enable and disable installed modules from the current Apache config. RHEL and Amazon have no concept of enabled and disabled modules. If it's installed it's enabled.

[ryandb]

Sorry I misunderstood your original request in Issue-121.

This IS a fix for a different issue however-- the issue being that this module does not work for Amazon Linux as it stands without this fix because there is no a2mod provider that will match.

This fix should still be accepted under the current design around a2mod providers.

If Issue-121 changes this design, we should make sure that Amazon Linux is also supported in the solution.

[tmclaugh]

I'd suggest a slight change to this commit. The file is exactly the same as the redhat.rb file except for the difference in the 'confine' and 'defaultfor' lines right? Could the redhat.rb file be altered to confine to either the 'redhat' $osfamily or the 'amazon' $operatingsystem. That would reduce the duplicate code and prevent skew if someone alters the redhat file and doesn't know to alter the amazon file.

[hunner]

Thanks for the PR! As the a2mod resource is no longer used internally by the module, and (as @tmclaugh correctly describes) is not particularly relevant on platforms other than Debian, I'm going to close this contribution.