Make update of a node save chef_environment

Note: we should consider refactoring so that the logic for updating an
existing node from another node lives in the node class.  Then the
addition of chef_environment would not have had to touch the nodes
controller at all.

Author: Seth Falcon

chef-server-api/app/controllers/nodes.rb

@@ -68,6 +68,7 @@ def update
     @node.normal_attrs = updated.normal_attrs
     @node.override_attrs = updated.override_attrs
     @node.default_attrs = updated.default_attrs
+    @node.chef_environment(updated.chef_environment)
     @node.cdb_save
     @node.couchdb_rev = nil
     display(@node)

features/api/nodes/update_node_api.feature

@@ -14,9 +14,10 @@ Feature: Update a node
      Then the inflated response should respond to '<method>' with '<updated_value>' 
 
     Examples:
-      | method       | updated_value    |
-      | run_list     | [ "recipe[one]", "recipe[two]" ] |
-      | snakes       | really arent so bad | 
+      | method           | updated_value                    |
+      | run_list         | [ "recipe[one]", "recipe[two]" ] |
+      | snakes           | really arent so bad              |
+      | chef_environment | prod                             |
 
   @PL-493
   Scenario: Update a node to include a role which includes another role