Synchronize importlib.metadata with importlib_metadata 0.22

[jaraco]

BPO	38121
Nosy	@jaraco, @pganssle
PRs	bpo-38121: Sync importlib.metadata with 0.22 backport #15993 [3.8] bpo-38121: Sync importlib.metadata with 0.22 backport (GH-15993) #16064

^{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/jaraco'
closed_at = <Date 2019-09-12.15:42:29.497>
created_at = <Date 2019-09-11.16:41:22.707>
labels = ['type-bug', '3.8', '3.9']
title = 'Synchronize importlib.metadata with importlib_metadata 0.22'
updated_at = <Date 2019-09-12.15:42:29.496>
user = 'https://github.com/jaraco'

bugs.python.org fields:

activity = <Date 2019-09-12.15:42:29.496>
actor = 'jaraco'
assignee = 'jaraco'
closed = True
closed_date = <Date 2019-09-12.15:42:29.497>
closer = 'jaraco'
components = []
creation = <Date 2019-09-11.16:41:22.707>
creator = 'jaraco'
dependencies = []
files = []
hgrepos = []
issue_num = 38121
keywords = ['patch']
message_count = 3.0
messages = ['351971', '352073', '352203']
nosy_count = 2.0
nosy_names = ['jaraco', 'p-ganssle']
pr_nums = ['15993', '16064']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue38121'
versions = ['Python 3.8', 'Python 3.9']

[jaraco]

Incorporate the changes from the 0.22 release (https://gitlab.com/python-devs/importlib_metadata/blob/0.22/importlib_metadata/docs/changelog.rst) including the new lightweight shim from PathFinder into importlib.metadata.MetadataPathFinder.

[pganssle]

New changeset 8ed6503 by Paul Ganssle (Jason R. Coombs) in branch 'master':
bpo-38121: Sync importlib.metadata with 0.22 backport (GH-15993)
8ed6503

[jaraco]

New changeset a0d4aac by Jason R. Coombs in branch '3.8':
[3.8] bpo-38121: Sync importlib.metadata with 0.22 backport (GH-15993) (GH-16064)
a0d4aac