When fields are inserted instead of * in the select list they were not marked
for check for the ONLY_FULL_GROUP_BY mode.

The Field_iterator_table::create_item() function now marks newly created
items for check when in the ONLY_FULL_GROUP_BY mode.
The setup_wild() and the insert_fields() functions now maintain the
cur_pos_in_select_list counter for the ONLY_FULL_GROUP_BY mode.


sql/sql_base.cc:
  Bug#27874: Non-grouped columns are allowed by * in ONLY_FULL_GROUP_BY mode.
  The setup_wild() and the insert_fields() functions now maintain the
  cur_pos_in_select_list counter for the ONLY_FULL_GROUP_BY mode.
sql/table.cc:
  Bug#27874: Non-grouped columns are allowed by * in ONLY_FULL_GROUP_BY mode.
  The Field_iterator_table::create_item() function now marks newly created
  items for check when in the ONLY_FULL_GROUP_BY mode.
mysql-test/r/group_by.result:
  Added a test case for the bug#27874: Non-grouped columns are allowed by * in ONLY_FULL_GROUP_BY mode.
mysql-test/t/group_by.test:
  Added a test case for the bug#27874: Non-grouped columns are allowed by * in ONLY_FULL_GROUP_BY mode.