Adding zsh as a prerequisite

salty/base/python_env/init.sls

@@ -8,6 +8,9 @@
   {% endif %}
 {% endif %}
 
+include:
+  - zsh
+
 pip-install:
   pkg.installed:
     - name: {{ python_env.pip }}
@@ -39,6 +42,8 @@ virtualenvwrapper-install:
 zsh-virtualenvwrapper:
   file.append:
     - name: {{ grains.homedir }}/.zshrc
+    - require:
+      - sls: zsh
     - text:
       - "\n"
       - "# Adding virtualenvwrapper python binary path"