When compiling INSERT statements the check whether columns are provided values
depends on the flag whether a field is used in that query (Field::query_id).
However the check for updatability of VIEW columns (check_view_insertability())
was calling fix_fields() and thus setting the Field::query_id even for the 
view fields that are not referenced in the current INSERT statement.
So the correct check for columns without default values 
( check_that_all_fields_are_given_values() ) is assuming that all the VIEW
columns were mentioned in the INSERT field list and was issuing no 
warnings or errors.
Fixed check_view_insertability() to turn off the flag whether or not to set
Field::query_id (THREAD::set_query_id) before calling fix fields and restore
it when it's done.


mysql-test/r/view.result:
  Bug #16110: insert permitted into view col w/o default value
    * test case
mysql-test/t/view.test:
  Bug #16110: insert permitted into view col w/o default value
    * test case
sql/sql_insert.cc:
  Bug #16110: insert permitted into view col w/o default value
    * avoid setting the "field used" flag for fields when checking view columns 
      for updatability.
    * a missing DBUG_RETURN added.