Improve some deprecations in the importlib

[Carreau]

BPO	29576
Nosy	@brettcannon, @ncoghlan, @vstinner, @serhiy-storchaka, @Carreau
PRs	bpo-29576: Improve some deprecations in the importlib #32 [Do Not Merge] Sample of CPython life with blurb. #703 [Do Not Merge] Convert Misc/NEWS so that it is managed by towncrier #552 bpo-30158: Fix deprecation warnings in test_importlib introduced by … #1285

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GitHub fields:

assignee = None
closed_at = <Date 2017-02-16.02:00:59.787>
created_at = <Date 2017-02-16.01:27:33.887>
labels = ['type-feature', '3.7', 'docs']
title = 'Improve some deprecations in the importlib'
updated_at = <Date 2017-04-29.04:06:51.374>
user = 'https://github.com/Carreau'

bugs.python.org fields:

activity = <Date 2017-04-29.04:06:51.374>
actor = 'serhiy.storchaka'
assignee = 'docs@python'
closed = True
closed_date = <Date 2017-02-16.02:00:59.787>
closer = 'brett.cannon'
components = ['Documentation']
creation = <Date 2017-02-16.01:27:33.887>
creator = 'mbussonn'
dependencies = []
files = []
hgrepos = []
issue_num = 29576
keywords = []
message_count = 5.0
messages = ['287908', '287909', '292277', '292286', '292561']
nosy_count = 6.0
nosy_names = ['brett.cannon', 'ncoghlan', 'vstinner', 'docs@python', 'serhiy.storchaka', 'mbussonn']
pr_nums = ['32', '703', '552', '1285']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue29576'
versions = ['Python 3.7']

[Carreau]

A couple of function in importlib are marked as deprecated in the documentation but do not raise deprecation warnings.

As the same time it would be great to improve some deprecation warnings and docstring to include the version since when this is deprecated.

This should be take care of by #32

[brettcannon]

New changeset 1d4601c by Brett Cannon in branch 'master':
bpo-29576: add explicit deprecation for importlib.abc.find_loader() and find_module() (GH-32)
1d4601c

[serhiy-storchaka]

This change made test_importlib emitting warnings. See bpo-30158.

[vstinner]

This issue introduced new warnings when running test_importlib: see issue bpo-30158.

[serhiy-storchaka]

New changeset 3cc8259 by Serhiy Storchaka in branch 'master':
bpo-30158: Fix deprecation warnings in test_importlib introduced by bpo-29576. (bpo-1285)
3cc8259