In WalkTests of test_os.py, sub2_tree missed the dir "SUB21" if symlink can't be supported.

BPO	35994
Nosy	@zware, @pxinwr
PRs	bpo-35994: add sub dir for sub2_tree in os.walk test if symlink is not supported #11853 [3.7] bpo-35994: add sub dir for sub2_tree in os.walk test if symlink is not supported (GH-11853) #11861

^{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 = <Date 2019-02-15.05:24:59.617>
created_at = <Date 2019-02-14.07:32:35.639>
labels = ['3.7', '3.8', 'type-bug', 'tests']
title = 'In WalkTests of test_os.py, sub2_tree missed the dir "SUB21" if symlink can\'t be supported.'
updated_at = <Date 2019-02-15.05:24:59.609>
user = 'https://github.com/pxinwr'

bugs.python.org fields:

activity = <Date 2019-02-15.05:24:59.609>
actor = 'zach.ware'
assignee = 'none'
closed = True
closed_date = <Date 2019-02-15.05:24:59.617>
closer = 'zach.ware'
components = ['Tests']
creation = <Date 2019-02-14.07:32:35.639>
creator = 'pxinwr'
dependencies = []
files = []
hgrepos = []
issue_num = 35994
keywords = ['patch']
message_count = 4.0
messages = ['335505', '335582', '335583', '335585']
nosy_count = 2.0
nosy_names = ['zach.ware', 'pxinwr']
pr_nums = ['11853', '11861']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue35994'
versions = ['Python 3.7', 'Python 3.8']