SELECT right instead of INSERT right was required for an insert into to a view.
This wrong behaviour appeared after the fix for bug #20989. Its intention was
to ask only SELECT right for all tables except the very first for a complex
INSERT query. But that patch has done it in a wrong way and lead to asking 
a wrong access right for an insert into a view.

The setup_tables_and_check_access() function now accepts two want_access
parameters. One will be used for the first table and the second for other
tables.


mysql-test/t/view.test:
  Added a test case for bug#21261: Wrong access rights was required for an insert into a view
mysql-test/r/view.result:
  Added a test case for bug#21261: Wrong access rights was required for an insert into a view
sql/sql_update.cc:
  Fixed bug#21261: Wrong access rights was required for an insert into a view
  Modified to use updated setup_tables_and_check_access() function.
sql/sql_select.cc:
  Fixed bug#21261: Wrong access rights was required for an insert into a view
  Modified to use updated setup_tables_and_check_access() function.
sql/sql_load.cc:
  Fixed bug#21261: Wrong access rights was required for an insert into a view
  Modified to use updated setup_tables_and_check_access() function.
sql/sql_insert.cc:
  Fixed bug#21261: Wrong access rights was required for an insert into a view
  Modified to use updated setup_tables_and_check_access() function.
sql/sql_delete.cc:
  Fixed bug#21261: Wrong access rights was required for an insert into a view
  Modified to use updated setup_tables_and_check_access() function.
sql/sql_base.cc:
  Fixed bug#21261: Wrong access rights was required for an insert into a view
  The setup_tables_and_check_access() function now accepts two want_access
  parameters. One will be used for the first table and the second for other
  tables.
sql/mysql_priv.h:
  Fixed bug#21261: Wrong access rights was required for an insert into a view
  The setup_tables_and_check_access() function now accepts two want_access
  parameters.