feat (LDAP) expose connection socket class

Author: christofferh

lib/net/ldap.rb

@@ -541,6 +541,7 @@ def initialize(args = {})
     @force_no_page = args[:force_no_page] || DefaultForceNoPage
     @encryption = normalize_encryption(args[:encryption]) # may be nil
     @connect_timeout = args[:connect_timeout]
+    @socket_class = args[:socket_class]
 
     if pr = @auth[:password] and pr.respond_to?(:call)
       @auth[:password] = pr.call
@@ -1305,7 +1306,8 @@ def new_connection
       :hosts                   => @hosts,
       :encryption              => @encryption,
       :instrumentation_service => @instrumentation_service,
-      :connect_timeout         => @connect_timeout
+      :connect_timeout         => @connect_timeout,
+      :socket_class            => @socket_class
 
     # Force connect to see if there's a connection error
     connection.socket