Support package versions (#134)

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

openssh/client.sls

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

openssh/init.sls

   {% if openssh.server is defined %}
   pkg.installed:
     - name: {{ openssh.server }}
+  {% if openssh.server_version is defined %}
+    - version: {{ openssh.server_version }}
+  {% endif %}
   {% endif %}
   {% if openssh.sshd_enable is sameas true %}
   service.running:

pillar.example

   banner_string: |
     Welcome to {{ grains['id'] }}!
 
+  # Set installed package version
+  server_version: latest
+  client_version: latest
+
   # Controls if SSHD should be enabled/started
   sshd_enable: true
   auth: