urllib.request.urlopen dies on non-basic/digest auth schemes

[samwyse]

BPO	21413
Nosy	@orsenthil

^{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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assignee = None
closed_at = None
created_at = <Date 2014-05-01.23:03:33.848>
labels = ['library']
title = 'urllib.request.urlopen dies on non-basic/digest auth schemes'
updated_at = <Date 2014-05-02.18:09:58.010>
user = 'https://bugs.python.org/samwyse'

bugs.python.org fields:

activity = <Date 2014-05-02.18:09:58.010>
actor = 'ned.deily'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2014-05-01.23:03:33.848>
creator = 'samwyse'
dependencies = []
files = []
hgrepos = []
issue_num = 21413
keywords = []
message_count = 1.0
messages = ['217734']
nosy_count = 3.0
nosy_names = ['orsenthil', 'samwyse', 'cvrebert']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue21413'
versions = ['Python 3.4', 'Python 3.5']

[samwyse]

In Python 2.x, this opens an NTLM protected URL:
opener = urllib2.build_opener(proxy_handler, auth_NTLM, auth_digest, auth_basic)
urllib2.install_opener(opener)
response = urllib2.urlopen(url)

In Python 3.x, this raises an error:
opener = urllib.request.build_opener(proxy_handler, auth_NTLM, auth_digest, auth_basic)
urllib.request.install_opener(opener)
response = urllib.request.urlopen(url)

The error is:
ValueError: AbstractDigestAuthHandler does not support the following scheme: 'NTLM'

Removing auth_digest from the list of handlers allows the code to work.