Add type field in Attributes Schema

The changes will add 'type' field in the attributes schema of
each resource plugin.

Specification blueprint add-type-in-attributes-schema

Change-Id: I581242df7bd5cb992372e25abc0746a5255ec55a

doc/source/index.rst

@@ -7,6 +7,7 @@ heat-specs Design Specifications
 
    specs/juno/*
    specs/kilo/*
+   specs/liberty/*
 
 
 heat-specs Repository Information

specs/liberty/type-in-attributes-schema.rst

@@ -0,0 +1,60 @@
+..
+ This work is licensed under a Creative Commons Attribution 3.0 Unported
+ License.
+
+ http://creativecommons.org/licenses/by/3.0/legalcode
+
+
+=============================
+ Attribute Type in schema
+=============================
+
+https://blueprints.launchpad.net/heat/+spec/add-type-in-attributes-schema
+
+This Blueprint proposes to add type field to attribute schema.
+
+Problem description
+===================
+
+Currently there is no way to find out what is the type of attribute returned
+by the get_attr function. This makes it difficult for the template authors to
+figure out what type of value will be returned. Indexing and Mapping on the
+attributes also becomes a issue without the knowledge of the attribute type.
+
+Proposed change
+===============
+
+The changes will be made in each resource plugin to add type field in the attribute
+schema. Type can be a String, Map or List. This will also generate the docs telling
+the users what type of value to expect from get_attr.
+
+Alternatives
+------------
+
+None
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  ishant-tyagi
+  rakesh_hs
+
+Milestones
+----------
+
+Target Milestone for completion:
+  Liberty-1
+
+Work Items
+----------
+
+* Add type field in schema of each resource plugin.
+
+Dependencies
+============
+
+None