(#3324) yumrepo doesn't support ssl options

[dieterdemeyer]

The yumrepo resource doesn't support attributes for SSL authentication.
This patch adds the following ssl attributes to the yumrepo resource:
sslcacert, sslverify, sslclientcert and sslclientkey.

There was no RSpec test present for the yumrepo resource.
So I have added a new test case, containing tests for the current attributes and also for the new ssl options.

[cprice404]

This looks like a good addition; working through some weirdness that I'm seeing when doing a full run of all of the specs, and if it's not related, I plan to merge this.

[cprice404]

The new test here started causing the specs to fail for me, but the failure turns out to be a bug in backups_spec.rb. That is fixed here:

https://github.com/puppetlabs/puppet/pull/524/files

Once that is merged, I believe that this change should be merged in as well. This branch is based on 2.7.x but I think it should probably go into master.

One other thing: there are some tests that look fairly useful here:

test/ral/type/yumrepo.rb

If I end up being the one to merge this in, I'll probably try to port those from the old unit test area into this new yum_repo spec test... just didn't have time today.

[cprice404]

I've run the full suite of specs locally using the combination of this commit and the one referenced above (pull request 524), and they all pass for me.

[cprice404]

I created a new branch off of this commit, and took one extra step of porting the existing yumrepo unit tests over to specs. Closing this pull request for that one:

#534