tarfile in stream mode always set zlib compression level to 9

PatrikDufresne

BPO	26253
Nosy	@gustaebel, @vadmium, @wimglenn, @zhangyangyu, @jarondl
PRs	bpo-26253: Add compressionlevel to tarfile stream #2962

^{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 = None
closed_at = None
created_at = <Date 2016-02-01.00:55:23.398>
labels = ['3.7', 'type-feature', 'library']
title = 'tarfile in stream mode always set zlib compression level to 9'
updated_at = <Date 2017-08-01.17:03:47.325>
user = 'https://bugs.python.org/PatrikDufresne'

bugs.python.org fields:

activity = <Date 2017-08-01.17:03:47.325>
actor = 'jarondl'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2016-02-01.00:55:23.398>
creator = 'Patrik Dufresne'
dependencies = []
files = []
hgrepos = []
issue_num = 26253
keywords = []
message_count = 6.0
messages = ['259304', '259308', '259987', '292628', '297220', '299622']
nosy_count = 6.0
nosy_names = ['lars.gustaebel', 'martin.panter', 'wim.glenn', 'xiang.zhang', 'Patrik Dufresne', 'jarondl']
pr_nums = ['2962']
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue26253'
versions = ['Python 3.7']