RUBY-1279 Move shared modules to shared directory

Author: estolfo

lib/mongo/bulk_write.rb

@@ -175,8 +175,8 @@ def execute_operation(name, values, server, operation_id, combiner, session, txn
         if values.size > server.max_write_batch_size
           split_execute(name, values, server, operation_id, combiner, session, txn_num)
         else
-          r = send(name, values, server, operation_id, session, txn_num)
-          combiner.combine!(r, values.size)
+          result = send(name, values, server, operation_id, session, txn_num)
+          combiner.combine!(result, values.size)
         end
       rescue Error::MaxBSONSize, Error::MaxMessageSize => e
         raise e if values.size <= 1

lib/mongo/operation.rb

@@ -1,7 +1,7 @@
 require 'forwardable'
 require 'mongo/operation/result'
+
 require 'mongo/operation/shared/executable'
-require 'mongo/operation/object_id_generator'
 require 'mongo/operation/shared/read_preference_supported'
 require 'mongo/operation/shared/bypass_document_validation'
 require 'mongo/operation/shared/write_concern_supported'
@@ -10,7 +10,9 @@
 require 'mongo/operation/shared/causal_consistency_supported'
 require 'mongo/operation/shared/write'
 require 'mongo/operation/shared/idable'
-require 'mongo/operation/specifiable'
+require 'mongo/operation/shared/specifiable'
+require 'mongo/operation/shared/object_id_generator'
+
 require 'mongo/operation/command'
 require 'mongo/operation/aggregate'
 require 'mongo/operation/result'
@@ -38,9 +40,6 @@
 require 'mongo/operation/create_index'
 require 'mongo/operation/drop_index'
 
-
-
-
 module Mongo
   module Operation