remove obsolete pywikibot.stopme() at the end these scripts.

In core branch pywikibot.stopme() is called by atexit library.
The function is executed upon normal program termination. This
patch prohibits executing it twice.

Change-Id: I7f8f33bf9ca9cb096af454aace6b0c14528773f6
Merge "remove obsolete pywikibot.stopme() at the end these scripts."