Add __slots__ = () to asyncio protocols

[asvetlov]

BPO	35394
Nosy	@asvetlov, @1st1
PRs	bpo-35394: Add empty slots to abstract asyncio protocols #10889

^{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 2018-12-18.21:59:58.322>
created_at = <Date 2018-12-03.21:59:26.910>
labels = ['3.8', 'expert-asyncio']
title = 'Add __slots__ = () to asyncio protocols'
updated_at = <Date 2018-12-18.21:59:58.321>
user = 'https://github.com/asvetlov'

bugs.python.org fields:

activity = <Date 2018-12-18.21:59:58.321>
actor = 'asvetlov'
assignee = 'none'
closed = True
closed_date = <Date 2018-12-18.21:59:58.322>
closer = 'asvetlov'
components = ['asyncio']
creation = <Date 2018-12-03.21:59:26.910>
creator = 'asvetlov'
dependencies = []
files = []
hgrepos = []
issue_num = 35394
keywords = ['patch']
message_count = 2.0
messages = ['330986', '331641']
nosy_count = 2.0
nosy_names = ['asvetlov', 'yselivanov']
pr_nums = ['10889']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue35394'
versions = ['Python 3.8']

[asvetlov]

Protocols have no members.

Adding empty slots doesn't harm any existing code but it allows to write proper protocol implementation with slot-based class.

[asvetlov]

New changeset 5344501 by Andrew Svetlov in branch 'master':
bpo-35394: Add empty slots to abstract asyncio protocols (bpo-10889)
5344501