Move this is Mock.key_id and don't default the path

lib/fog/aws.rb

@@ -224,7 +224,12 @@ module Fog
       def self.volume_id
         "vol-#{Fog::Mock.random_hex(8)}"
       end
-      
+
+      def self.key_id(length=21)
+        #Probably close enough
+        Fog::Mock.random_selection('ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789',length)
+      end
+
       def self.rds_address(db_name,region)
         "#{db_name}.#{Fog::Mock.random_letters(rand(12) + 4)}.#{region}.rds.amazonaws.com"
       end

lib/fog/aws/iam.rb

@@ -64,8 +64,7 @@ module Fog
               :server_certificates => {},
               :users => Hash.new do |uhash, ukey|
                 uhash[ukey] = {
-                  :user_id     => Fog::Mock.random_selection('ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789', 21),
-                  :path        => '/',
+                  :user_id     => Fog::AWS::Mock.key_id,
                   :arn         => "arn:aws:iam::#{Fog::AWS::Mock.owner_id}:user/#{ukey}",
                   :access_keys => [],
                   :policies    => {}