implemented copy db snapshot parser

lib/fog/aws/parsers/rds/copy_db_snapshot.rb

@@ -0,0 +1,32 @@
+module Fog
+  module Parsers
+    module AWS
+      module RDS
+        require 'fog/aws/parsers/rds/snapshot_parser'
+
+        class CopyDBSnapshot < Fog::Parsers::AWS::RDS::SnapshotParser
+          def reset
+            @response = { 'CopyDBSnapshotResult' => {}, 'ResponseMetadata' => {} }
+            super
+          end
+
+          def start_element(name, attrs = [])
+            super
+          end
+
+          def end_element(name)
+            case name
+            when 'DBSnapshot' then
+              @response['CopyDBSnapshotResult']['DBSnapshot'] = @db_snapshot
+              @db_snapshot = fresh_snapshot
+            when 'RequestId'
+              @response['ResponseMetadata'][name] = value
+            else
+              super
+            end
+          end
+        end
+      end
+    end
+  end
+end

lib/fog/aws/requests/rds/copy_db_snapshot.rb

@@ -22,7 +22,7 @@ module Fog
             'SourceDBSnapshotIdentifier' => source_db_snapshot_identifier,
             'TargetDBSnapshotIdentifier' => target_db_snapshot_identifier,
             'CopyTags'                   => copy_tags,
-            :parser                      => Fog::Parsers::AWS::RDS::CreateDBSnapshot.new
+            :parser                      => Fog::Parsers::AWS::RDS::CopyDBSnapshot.new
           )
         end
       end