Docs for urllib.request.HTTPRedirectHandler.redirect_request missing "hdrs" paramether

[mroman]

BPO	4894
Nosy	@birkenfeld, @orsenthil, @devdanzin
Files	redirect_request_rst.diff: Adds "newurl" to docs, mention URI header in http_error_301

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/birkenfeld'
closed_at = <Date 2009-02-13.10:43:37.617>
created_at = <Date 2009-01-09.13:58:35.252>
labels = ['easy', 'type-feature', 'docs']
title = 'Docs for urllib.request.HTTPRedirectHandler.redirect_request missing "hdrs" paramether'
updated_at = <Date 2009-02-13.10:43:37.616>
user = 'https://bugs.python.org/mroman'

bugs.python.org fields:

activity = <Date 2009-02-13.10:43:37.616>
actor = 'georg.brandl'
assignee = 'georg.brandl'
closed = True
closed_date = <Date 2009-02-13.10:43:37.617>
closer = 'georg.brandl'
components = ['Documentation']
creation = <Date 2009-01-09.13:58:35.252>
creator = 'mroman'
dependencies = []
files = ['12984']
hgrepos = []
issue_num = 4894
keywords = ['patch', 'easy']
message_count = 3.0
messages = ['79468', '81417', '81901']
nosy_count = 5.0
nosy_names = ['georg.brandl', 'quiver', 'orsenthil', 'ajaksu2', 'mroman']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'patch review'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue4894'
versions = ['Python 2.6', 'Python 3.0', 'Python 3.1', 'Python 2.7']

[mroman]

documentaion doesn't include parameter in
urllib.request.HTTPRedirectHandler.redirect_request

http://docs.python.org/3.0/library/urllib.request.html#urllib.request.HT
TPRedirectHandler.redirect_request

says:
HTTPRedirectHandler.redirect_request(req, fp, code, msg, hdrs)

while code says:
    def redirect_request(self, req, fp, code, msg, headers, newurl):

[devdanzin]

This patch adds the "newurl" parameter to signature of redirect_request
(important, IMHO) and mentions it in the doc (less important). It also
describes the behavior of http_error_30* in more detail, perhaps too much?

[birkenfeld]

Applied in r69570, r69571.