Add exclude and includepkgs options for redhat repos

Signed-off-by: M. David Bennett <mdavidbennett@syntheticworks.com>

README.rst

             source: 'http://repos.fedorapeople.org/repos/openstack/openstack-icehouse/epel-6/'
             gpgcheck: 0
 
+RedHat-based Linux with Salt Project repo, pinned to version 3006:
+
+.. code-block:: yaml
+
+    linux:
+      system:
+        ...
+        repo:
+          saltproject:
+            enabled: true
+            gpgkey: https://packages.broadcom.com/artifactory/api/security/keypair/SaltProjectKey/public
+            source: https://packages.broadcom.com/artifactory/saltproject-rpm/
+            includepkgs: "*3006*"
+
 Ensure system repository to use czech Debian mirror (``default: true``)
 Also pin it's packages with priority ``900``:
 

linux/system/repo.sls

           {%- if repo.gpgkey is defined %}
   - gpgkey: {{ repo.gpgkey }}
           {%- endif %}
+          {%- if repo.includepkgs is defined %}
+  - includepkgs: "{{ repo.includepkgs }}"
+          {%- endif %}
+          {%- if repo.exclude is defined %}
+  - exclude: "{{ repo.exclude }}"
+          {%- endif %}
         {%- endif %}
       {%- else %}
   pkgrepo.absent: