Correct faulty Chef search query

The search returns a Hash, not a list, so we need
to remove the reference to [0] in the memcached_servers
library routine call otherwise you get:

undefined method `[]' for nil:NilClass

in chef-client runs.

Change-Id: I479aca833a2eb80fa2baf3e54809b2edaa713b89

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 This file is used to list changes made in each version of cookbook-openstack-common.
 
+## 0.3.1:
+* Corrected a faulty Chef search query with `#config_by_role`.  The search returns a
+  Hash, not an array.
+
 ## 0.3.0:
 * Added `#rabbit_servers` method, which returns a comma-delimited string of rabbit
   servers in the format of host:port.

libraries/roles.rb

@@ -39,7 +39,7 @@ module ::Openstack
         log("Searched for role #{role} by found no nodes with that role in run list.") { level :debug }
         nil
       else
-        section.nil? ? result[0] : result[0][section]
+        section.nil? ? result : result[section]
       end
     end
   end

metadata.rb

@@ -4,7 +4,7 @@ maintainer_email "cookbooks@lists.tfoundry.com"
 license          "Apache 2.0"
 description      "Common OpenStack attributes, libraries and recipes."
 long_description IO.read(File.join(File.dirname(__FILE__), 'README.md'))
-version          "0.3.0"
+version          "0.3.1"
 
 recipe           "openstack-common", "Installs/Configures common recipes"
 recipe           "openstack-common::logging", "Installs/Configures common logging"

spec/roles_spec.rb

@@ -39,24 +39,20 @@ describe ::Openstack do
     end
 
     it "returns section when section in first search result" do
-      nodes = [
-        { "foo" => "bar" }
-      ]
+      node = { "foo" => "bar" }
       @subject.stub(:search_for).
         with("role1").
-        and_return nodes
+        and_return node
       @subject.stub(:node).and_return @chef_run.node
 
       expect(@subject.config_by_role("role1", "foo")).to eq "bar"
     end
 
     it "returns full node hash when search match but no section supplied" do
-      nodes = [
-        { "foo" => "bar" }
-      ]
+      node = { "foo" => "bar" }
       @subject.stub(:search_for).
         with("role1").
-        and_return nodes
+        and_return node
       @subject.stub(:node).and_return @chef_run.node
 
       expect(@subject.config_by_role("role1")).to eq("foo" => "bar")