template.py: remove deprecated XmlDumpTemplatePageGenerator
template.py: remove deprecated XmlDumpTemplatePageGenerator

Fix site as keyword parameter to avoid warning from Bot class:
- warning('Bot.site was not set before being retrieved.')

Change-Id: I4c87cb7ecfdca0d32a08691713ebb5b676540358

wikimedia/pywikibot-core,jayvdb/pywikibot-core,magul/pywikibot-core,hasteur/g13bot_tools_new,npdoty/pywikibot,hasteur/g13bot_tools_new,happy5214/pywikibot-core,hasteur/g13bot_tools_new,jayvdb/pywikibot-core,wikimedia/pywikibot-core,magul/pywikibot-core,npdoty/pywikibot,Darkdadaah/pywikibot-core,Darkdadaah/pywikibot-core,PersianWikipedia/pywikibot-core,happy5214/pywikibot-core