Generate salt minion orchestration config

The patch adds _orchestrate.conf file to salt minion
configuration. Its template searches for "/meta/salt.yml"
file across all installed formulas and parses them if found.
As of now config will contain following data, e.g.:
orchestration:
  deploy:
    applications:
      cinder:
        priority: 150
      keystone:
        priority: 100

Application priorities will be used later for salt deploy
orchestration

Change-Id: I56b0d15e5a13ca4975d98b9675991f84885120e6
Related-PROD: PROD-19973

salt/files/_orchestration.conf

@@ -0,0 +1,20 @@
+{%- from "salt/map.jinja" import master with context %}
+{%- if master.enabled %}
+  {%- for environment_name, environment in master.get('environment', {}).iteritems() %}
+      {%- set formulas = environment.get('formula', {}) %}
+      {%- set priorities = {'orchestration':{'deploy':{'applications':{}}}} %}
+      {%- for formula_name, formula in formulas.iteritems() %}
+        {%- if salt['file.file_exists'](master.dir.files+'/'+environment_name+'/'+formula_name+'/meta/salt.yml') %}
+          {%- set orch_fragment_file = formula_name+'/meta/salt.yml' %}
+          {%- macro load_orch_file() %}{% include orch_fragment_file %}{% endmacro %}
+          {%- set orch_yaml = load_orch_file()|load_yaml %}
+            {%- if orch_yaml.orchestration is defined %}
+            {%- do priorities['orchestration']['deploy']['applications'].update({ formula_name: orch_yaml['orchestration']['deploy']['applications'][formula_name] }) %}
+            {%- endif %}
+        {%- endif %}
+      {%- endfor %}
+  {%- if priorities.orchestration.deploy.applications -%}
+{{ priorities|yaml(False) }}
+  {%- endif %}
+  {%- endfor %}
+{%- endif %}

salt/master/minion.sls

@@ -4,6 +4,15 @@
 include:
 - salt.master.service
 
+/etc/salt/minion.d/_orchestration.conf:
+  file.managed:
+  - source: salt://salt/files/_orchestration.conf
+  - user: root
+  - template: jinja
+  - makedirs: true
+  - require:
+    - {{ master.install_state }}
+
 {%- if master.minion is defined %}
 
 /srv/salt/minion_keys: