! Fixes connection open bug

Without this require, even the simplest example will fail, since TCPSocket
is not defined. Our tests were faking this by including openssl and socket.

lib/net/ldap.rb

@@ -1,6 +1,8 @@
 require 'openssl'
 require 'ostruct'
 
+require 'socket'
+
 require 'net/ber'
 require 'net/ldap/pdu'
 require 'net/ldap/filter'

spec/integration/ssl_ber_spec.rb

@@ -1,8 +1,5 @@
 require 'spec_helper'
 
-require 'socket'
-require 'openssl'
-
 require 'net/ldap'
 
 describe "BER serialisation (SSL)" do