No longer stub out uri_from_hash

Since we pull in the cookbooks with librarian, let chef act as it would.
Plus `::Openstack::uri_from_hash` isn't a valid method call.

libraries/default.rb

@@ -35,7 +35,7 @@ module Openstack
     if ep && ep.has_key?("uri")
       ep["uri"]
     elsif ep
-      ::Openstack::uri_from_hash(ep).to_s
+      uri_from_hash(ep).to_s
     end
   end
 

spec/default_spec.rb

@@ -73,7 +73,6 @@ describe ::Openstack do
           }
        }
       }
-      ::Openstack.stub(:uri_from_hash).and_return "http://localhost"
       @subject.instance_variable_set :@node, uri_hash
       @subject.endpoint_uri("compute-api").should eq "http://localhost"
     end