Add constructor for HTTPError in urllib2/urllib.error #2373
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It seems that code passing in keyword arguments when instantiating HTTPError previously worked by accident because we used to accept arbitrary keyword arguments when instantiating BaseException, or any subclass of BaseException (see #2348).
This is no longer the case, due to the change made in the PR linked up above.
This commit adds in the correct constructor (which also lets the user specify the arguments in keyword-argument form).
Note: I'm not very familiar with the urllib libraries, so I opted to just add the signature and leave it up to somebody else to fill in the types.