trace module cli does not write cover files

BPO	31908
Nosy	@rhettinger, @abalkin, @berkerpeksag, @serhiy-storchaka, @selik, @ZackerySpytz, @miss-islington
PRs	bpo-31908: Fix output of cover files for trace module command-line tool #4205 [3.7] bpo-31908: Fix output of cover files for trace module command-line tool. (GH-4205) #6666 [3.6] bpo-31908: Fix output of cover files for trace module command-line tool. (GH-4205) #6667 [3.6] bpo-31908: Fix output of cover files for trace module command-line tool. (GH-4205) #6668 bpo-26818: Add a test to make sure the bug is fixed #8664 [3.7] bpo-26818: Add a test to make sure the bug is fixed (GH-8664) #8732

^{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 2017-10-31.02:55:06.847>
labels = ['3.7', 'type-bug', 'library']
title = 'trace module cli does not write cover files'
updated_at = <Date 2018-08-11.06:28:37.697>
user = 'https://bugs.python.org/MichaelSelik'

bugs.python.org fields:

activity = <Date 2018-08-11.06:28:37.697>
actor = 'berker.peksag'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2017-10-31.02:55:06.847>
creator = 'Michael Selik'
dependencies = []
files = []
hgrepos = []
issue_num = 31908
keywords = ['patch']
message_count = 13.0
messages = ['305268', '305269', '305341', '305343', '305347', '305367', '306173', '315980', '315981', '315984', '323058', '323401', '323403']
nosy_count = 8.0
nosy_names = ['rhettinger', 'belopolsky', 'berker.peksag', 'serhiy.storchaka', 'selik', 'Michael Selik', 'ZackerySpytz', 'miss-islington']
pr_nums = ['4205', '6666', '6667', '6668', '8664', '8732']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue31908'
versions = ['Python 3.6', 'Python 3.7']