fix graphite requirements

salt/graphite/files/requirements.txt

@@ -9,6 +9,6 @@ pytz
 pyparsing
 whisper
 {% if grains['os_family'] != 'RedHat' %}
-carbon==0.9.12 --install-option="--prefix=/opt/graphite" --install-option="--install-lib=/opt/graphite/lib"
+carbon==0.9.12 {% if grains['osfinger'] == 'Ubuntu-16.04' %}--install-option="--prefix=/opt/graphite" --install-option="--install-lib=/opt/graphite/lib"{% endif %}
 {% endif %}
-graphite-web --install-option="--prefix=/opt/graphite" --install-option="--install-lib=/opt/graphite/webapp"
+graphite-web {% if grains['osfinger'] == 'Ubuntu-16.04' %}--install-option="--prefix=/opt/graphite" --install-option="--install-lib=/opt/graphite/webapp"{% endif %}