Potentially flaky CI test (TestCancelRequest)

[slimsag]

From CI logs:

--- FAIL: TestCancelRequest (0.02s)
    client_test.go:142: got &url.Error{Op:"Get", URL:"http://example.com/foo", Err:(*http.httpError)(0xc82000b860)}, want Get http://example.com/foo: net/http: request canceled while waiting for connection

If it pops up again we can investigate.

[chris-ramon]

It did fail today again on travis - did not see it failing locally so far.

[chris-ramon]

failed again today on travis i'll look in deep as soon as have the chance.