Add ABRT plugins and a dependency

rubygem-foreman_abrt
rubygem-smart_proxy_abrt
rubygem-satyr

NOTE: I used `smart_proxy_pulp` as a template, which is added under `foreman-plugins-nightly-rhel6` in `tito.props`. If I understand correctly the rhel6 plugins are built in `ruby193` collection, however the proxy itself is built without the collection - won't it lead to problems?
I think we need to exclude this and %check on EL7 too:

<pre>
DEBUG util.py:264:  Getting requirements for rubygem-smart_proxy_abrt-0.0.2-1.git.0.ed483e7.git.0.ed483e7.git.0.ed483e7.el7.src
DEBUG util.py:264:   --> ruby-libs-2.0.0.353-20.el7.x86_64
DEBUG util.py:264:   --> rubygems-devel-2.0.14-20.el7.noarch
DEBUG util.py:264:   --> rubygems-2.0.14-20.el7.noarch
DEBUG util.py:264:   --> rubygem-minitest-4.3.2-20.el7.noarch
DEBUG util.py:264:   --> rubygem-mocha-0.14.0-1.el7.noarch
DEBUG util.py:264:  Error: No Package found for rubygem(rack-test)
</pre>

(https://bugzilla.redhat.com/show_bug.cgi?id=1096201 for EPEL7 is missing)