[MERGE] Add traffic support to HTTP

[John Arbash Meinel]

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Attached is a patch to our HTTP implementations so that
HTTPTransport.get() and HTTPTransport.readv() use the new
_report_activity functionality to let the user know that data is coming
across on the wire.

I decided to do it in osutils.pumpfile() with the idea that if a
specific range ended up being >32kB you get more feedback this way.

With this in place, it does start giving some update ticks while doing
"bzr branch http://bazaar-vcs.org/bzr/bzr.dev" which is nice (especially
since there is a pretty long startup time as it searches the ancestry
graph.)

The only other bit that we *might* want to do, is to consider the HTTP
headers, etc. I figured tracking the bulk data was good enough, though.

As near as I can tell, both pycurl and urllib go through
bzrlib.transport.http.response.handle_response() and that always goes
through osutils.pumpfile() to handle all of the .read() requests. So by
instrumenting it at this level, we should avoid any double-handling or
missing data being sent.

John
=:->

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