Added support for managing files by pillar

Change-Id: Ibd0a024bcd69089d9835a18f2bb803c952e13967

README.rst

             mode: 700
             makedirs: true
 
+Ensure presence of file by specifying it's source:
+
+.. code-block:: yaml
+
+    linux:
+      system:
+        file:
+          /tmp/test.txt:
+            source: http://example.com/test.txt
+            user: root
+            group: root
+            file_mode: 700
+            dir_mode: 700
+            encoding: utf-8
+            hash: <<md5 hash>>
+            makedirs: true
+
+Ensure presence of file by specifying it's contents:
+
+.. code-block:: yaml
+
+    linux:
+      system:
+        file:
+          /tmp/test.txt:
+            contents: |
+              line1
+              line2
+            user: root
+            group: root
+            file_mode: 700
+            dir_mode: 700
+            encoding: utf-8
+            hash: <<md5 hash>>
+            makedirs: true
 Kernel
 ~~~~~~
 

linux/system/file.sls

+{%- from "linux/map.jinja" import system with context %}
+{%- if system.enabled %}
+
+{%- for file_name, file in system.file.iteritems() %}
+
+{{ file_name }}:
+  file.managed:
+    {%- if file.source is defined %}
+    - source: {{ file.source }}
+    {%- endif %}
+    {%- if file.contents is defined %}
+    - contents: {{ file.contents }}
+    {%- endif %}
+    - makedirs: {{ file.get('makedirs', 'True') }}
+    - user: {{ file.get('user', 'root') }}
+    - group: {{ file.get('group', 'root') }}
+    {%- if file.file_mode is defined %}
+    - file_mode: {{ file.file_mode }}
+    {%- endif %}
+    {%- if file.dir_mode is defined %}
+    - dir_mode: {{ file.dir_mode }}
+    {%- endif %}
+    {%- if file.encoding is defined %}
+    - encoding: {{ file.encoding }}
+    {%- endif %}
+    {%- if file.hash is defined %}
+    - source_hash: {{ file.hash }}
+    {%- else %}
+    - skip_verify: True
+    {%- endif %}
+
+{%- endfor %}
+
+{%- endif %}

linux/system/init.sls

 {%- if system.directory is defined %}
 - linux.system.directory
 {%- endif %}
+{%- if system.file is defined %}
+- linux.system.file
+{%- endif %}
 {%- if system.ld is defined %}
 - linux.system.ld
 {%- endif %}