Handle redirects

Handle redirect HTTP responses, in particular if a Bugzilla server
is redirecting from http to https.

We try to detect "Bugzilla URL base is over here" when we ask for
show_bug.cgi and remember that for future requests to the same BugServer
to avoid too many redirections.

Switch from caching connection on the BugServer to a global connection
cache, and rewrite the BugServer cache so to deal with the possibility
of redirections.

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