drop bugs.wikipedia.org

this has been challenged before in bugs like

bug 14378
bug 14546

for being confused with bug.wikipedia.org the language
which is Buginese

ISO 639-2 BUG -  spoken by about four million people
mainly in the southern part of Sulawesi, Indonesia.

and ALSO it is in SSL related bugs like blocking
RT #2675 and an annoyance now when moving Bugzilla
to new server... AND wikipedia subdomains should just be
wikis, other services are wikimedia.org, etc.. so, just:

drop support for it entirely

Change-Id: I692ede1e8a5f8dc2055d5f08eb78d6cd600ada81