- re-arrange cluster initialization to a set of variables in a dictionary

which control three things:
    1. should we initialize?
    2. if so, how?
    3. what environment variables and user to use
  The approach taken is very similar to what the Apache formula uses, namely:
  a default dictionary which is over-ridden by:
     os-specific defaults,
     then os codename defaults,
     then os finger defaults,
     and finally user-specified pillar values
- this also adds support for grains['osfinger']

postgres/codenamemap.yaml

@@ -1,9 +1,13 @@
 {%- macro ubuntu_block(name, version) %}
 {{ name }}:
-  version: {{ version }}
   pkg_repo: deb http://apt.postgresql.org/pub/repos/apt/ {{ name }}-pgdg main
   conf_dir: /etc/postgresql/{{ version }}/main
-  data_dir: /var/lib/postgresql/{{ version }}/main
+  prepare_cluster:
+    command: pg_createcluster {{ version }} main
+    test: test -f /var/lib/postgresql/{{ version }}/main/PG_VERSION && test -f /etc/postgresql/{{ version }}/main/postgresql.conf
+    user: root
+    env:
+      LC_ALL: C.UTF-8
 {%- endmacro %}
 
 {{ ubuntu_block('wheezy', 9.1) }}