Convert test_bz2 to use tempfile

BPO	34239
Nosy	@brettcannon, @tjguk, @serhiy-storchaka
PRs	bpo-34239: Convert test_bz2 to use tempfile #8485

^{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/tjguk'
closed_at = <Date 2018-07-28.17:28:37.361>
created_at = <Date 2018-07-26.17:28:08.907>
labels = ['type-bug', '3.8']
title = 'Convert test_bz2 to use tempfile'
updated_at = <Date 2018-07-28.17:28:37.360>
user = 'https://github.com/tjguk'

bugs.python.org fields:

activity = <Date 2018-07-28.17:28:37.360>
actor = 'tim.golden'
assignee = 'tim.golden'
closed = True
closed_date = <Date 2018-07-28.17:28:37.361>
closer = 'tim.golden'
components = []
creation = <Date 2018-07-26.17:28:08.907>
creator = 'tim.golden'
dependencies = []
files = []
hgrepos = []
issue_num = 34239
keywords = ['patch']
message_count = 5.0
messages = ['322441', '322451', '322461', '322517', '322528']
nosy_count = 4.0
nosy_names = ['brett.cannon', 'tim.golden', 'serhiy.storchaka', 'tjguk']
pr_nums = ['8485']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue34239'
versions = ['Python 3.8']