Initialization of fields for sp return type was not complete.


mysql-test/r/sp.result:
  Bug#9102
    Test for bug
mysql-test/t/sp.test:
  Bug#9102
    Test for bug
sql/mysql_priv.h:
  Bug#9102
    new function: sp_prepare_create_field()
sql/sp_head.cc:
  Strip spaces and do charset conversion for sp function typelibs
sql/sql_table.cc:
  Bug#9102
    new function - sp_prepare_create_field()
    prepares create_field in similar way to mysql_prepare_table()
sql/sql_yacc.yy:
  Bug#9102