Fix bug #15706 find_field_in_tables() returns field from outer select

If item->cached_table is set, find_field_in_tables() returns found field
even if it doesn't belong to current select. Because Item_field::fix_fields
doesn't expect such behaviour, reported bug occurs.

Item_field::fix_fields() was modifed to detect when find_field_in_tables() 
can return field from outer select and process such fields accordingly.
In order to ease this code which was searching and processing outed fields was
moved into separate function called Item_field::fix_outer_field().


sql/item_subselect.h:
  Fixed bug #15706: find_field_in_tables() returns field from outer select
  Item_field::fix_outer_field() was marked as friend to Item_subselect class.
sql/item.h:
  Fixed bug #15706: find_field_in_tables() returns field from outer select
  fix_outer_field() function is added to the Item_field class.
sql/item.cc:
  Fixed bug #15706: find_field_in_tables() returns field from outer select
  
  Item_ref::fix_fields() and Item_field::fix_fields() were modifed to detect when
  find_field_in_tables() can return field from outer select and process such
  fields accordingly.
  In order to ease this, code Item_field::fix_fields() which was searching and
  processing outer fields was moved into separate function called
  Item_field::fix_outer_field().
  To the Item_field::fix_field() added a loop for finding context for found field.
mysql-test/t/disabled.def:
  Fixed bug #15706: find_field_in_tables() returns field from outer select
  Enable subselect test

mysql-test/t/disabled.def

@@ -12,4 +12,3 @@
 
 sp-goto         : GOTO is currently is disabled - will be fixed in the future
 kill            : Unstable test case, bug#9712
-subselect       : Bug#15706

sql/item.h

@@ -1161,6 +1161,7 @@ public:
   inline uint32 max_disp_length() { return field->max_length(); }
   Item_field *filed_for_view_update() { return this; }
   Item *safe_charset_converter(CHARSET_INFO *tocs);
+  int fix_outer_field(THD *thd, Field **field, Item **reference);
   friend class Item_default_value;
   friend class Item_insert_value;
   friend class st_select_lex_unit;

sql/item_subselect.h

@@ -125,6 +125,7 @@ public:
   friend class select_subselect;
   friend class Item_in_optimizer;
   friend bool Item_field::fix_fields(THD *, Item **);
+  friend int  Item_field::fix_outer_field(THD *, Field **, Item **);
   friend bool Item_ref::fix_fields(THD *, Item **);
   friend void mark_select_range_as_dependent(THD*,
                                              st_select_lex*, st_select_lex*,