Add slots to asyncio transports

[asvetlov]

BPO	38148
Nosy	@asvetlov, @1st1
PRs	bpo-38148: Add slots to asyncio transports #16077 [3.8] bpo-38148: Add slots to asyncio transports (GH-16077) #16093

^{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 2019-09-13.13:15:15.670>
created_at = <Date 2019-09-13.05:54:41.029>
labels = ['3.8', '3.9', 'expert-asyncio']
title = 'Add slots to asyncio transports'
updated_at = <Date 2019-09-13.13:15:15.670>
user = 'https://github.com/asvetlov'

bugs.python.org fields:

activity = <Date 2019-09-13.13:15:15.670>
actor = 'asvetlov'
assignee = 'none'
closed = True
closed_date = <Date 2019-09-13.13:15:15.670>
closer = 'asvetlov'
components = ['asyncio']
creation = <Date 2019-09-13.05:54:41.029>
creator = 'asvetlov'
dependencies = []
files = []
hgrepos = []
issue_num = 38148
keywords = ['patch']
message_count = 4.0
messages = ['352239', '352240', '352307', '352318']
nosy_count = 2.0
nosy_names = ['asvetlov', 'yselivanov']
pr_nums = ['16077', '16093']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue38148'
versions = ['Python 3.8', 'Python 3.9']

[asvetlov]

Transports are abstract interfaces.
Adding slots allows using slots in transport implementations as well.
If the implementation doesn't use slots -- everything keeps working.

Slots can help with saving a memory footprint a little.

[asvetlov]

Note, slots for protocols are provided by 3.8 already.

[asvetlov]

New changeset 9eb35ab by Andrew Svetlov in branch 'master':
bpo-38148: Add slots to asyncio transports (GH-16077)
9eb35ab

[asvetlov]

New changeset 6638c92 by Andrew Svetlov in branch '3.8':
[3.8] bpo-38148: Add slots to asyncio transports (GH-16077) (GH-16093)
6638c92