graphite: fix carbon install problem on redhat systems

salt/graphite/configuration.sls

@@ -10,6 +10,7 @@ postactivate:
 requirements:  
   file.managed:
       - name: /home/{{ pillar['graphite']['user'] }}/requirements.txt
+      - template: jinja
       - source: salt://graphite/files/requirements.txt
       - user: {{ pillar['graphite']['user'] }}
       - group: {{ pillar['graphite']['user'] }}

salt/graphite/files/requirements.txt

@@ -8,5 +8,7 @@ gunicorn
 pytz
 pyparsing
 whisper
+{% if grains['os_family'] != 'RedHat' %} 
 carbon==0.9.12
+{% endif %}
 graphite-web

salt/graphite/virtualenv.sls

+{% if grains['os_family'] == 'RedHat' %}
+python-carbon:
+  pkg.installed
+{% endif %}
+
 virtualenv_graphite:
   virtualenv.managed:
     - name: /home/{{ pillar['graphite']['user'] }}/.virtualenvs/graphite