inserted.

The select_insert::send_eof() function now resets LAST_INSERT_ID variable if
no rows were inserted.


mysql-test/t/insert_select.test:
  Added a test case for bug#23170: LAST_INSERT_ID isn't reset to 0 in INSERT .. SELECT when no rows were inserted.
mysql-test/r/insert_select.result:
  Added a test case for bug#23170: LAST_INSERT_ID isn't reset to 0 in INSERT .. SELECT when no rows were inserted.
sql/sql_insert.cc:
  Bug#23170: LAST_INSERT_ID isn't reset to 0 in INSERT .. SELECT when no rows were
  inserted.The select_insert::send_eof() function now resets LAST_INSERT_ID variable if
  no rows were inserted.