* bzrlib/transport/http/__init__.py: (HttpTransportBase._readv): Fix some trivial bugs revealed by the test suite. (HttpTransportBase._coalesce_readv): Fix list splice access, first seen by jam, but found by the test suite too.
* bzrlib/tests/test_http.py: Fix some imports. (TestRangeRequestServer.test_readv_multiple_get_requests): Exercise the rewritten readv.
* bzrlib/tests/HttpServer.py: (TestingHTTPRequestHandler.do_GET): Count the requests (more tests use that info).
* bzrlib/tests/HTTPTestUtil.py: (LimitedRangeRequestHandler.do_GET): The statistics are collected in the base request handler now. (NoRangeRequestHandler.do_GET): But since we bypass the base handler, re-enable the statistics collection here.