move web_server for unit tests over to python

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9269 a83610d8-ad2a-0410-a6ab-fc0612d85776
split up the web seed tests further into chunked encoding and banning of web seeds as their own tests

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9271 a83610d8-ad2a-0410-a6ab-fc0612d85776