Validation functions for resources and outputs

This patch add ability to validate values in outputs section and also
validate properties in resource snippets.

Related-Bug: #1273490
Change-Id: I9ccb880954751555709bd92f2412cf5606969e70

heat/engine/parser.py

@@ -364,6 +364,14 @@ class Stack(collections.Mapping):
             if result:
                 raise StackValidationFailed(message=result)
 
+            for val in self.outputs.values():
+                snippet = val.get('Value', '')
+                try:
+                    function.validate(snippet)
+                except Exception as ex:
+                    reason = 'Output validation error: %s' % str(ex)
+                    raise StackValidationFailed(message=reason)
+
     def requires_deferred_auth(self):
         '''
         Returns whether this stack may need to perform API requests

heat/engine/resource.py

@@ -18,6 +18,7 @@ from datetime import datetime
 
 from heat.engine import event
 from heat.common import exception
+from heat.engine import function
 from heat.openstack.common import excutils
 from heat.db import api as db_api
 from heat.common import identifier
@@ -642,6 +643,7 @@ class Resource(object):
     def validate(self):
         logger.info(_('Validating %s') % str(self))
 
+        function.validate(self.t)
         self.validate_deletion_policy(self.t)
         return self.properties.validate()