merge from 3.2 - Fix closes Issue12478 - HTTPErrorProcess 's methods are http_response and https_response.

merge from 3.2 - Fix closes Issue12479 - Add HTTPErrorProcessor class definition - Patch by Sandro Tosi

Fix Issue10403 - datetime documentation clarification based on review in the reitveld by Alexendar belopolsky.

shutdown() is called, without waiting for the garbage collector to kick in.

by joining all queues and processes when shutdown() is called.

Patch by Andreas Stührk.

Patch by Andreas Stührk.

Patch by Andreas Stührk.