Support package versions (#134)

added possibility to configure server version and client version
with pillar example

openssh/client.sls

@@ -3,3 +3,6 @@
 openssh_client:
   pkg.installed:
     - name: {{ openssh.client }}
+    {% if openssh.client_version is defined %}
+    - version: {{ openssh.client_version }}
+    {% endif %}