Enable TCP_NODELAY for proactor event loop

[asvetlov]

BPO	35380
Nosy	@asvetlov, @1st1
PRs	bpo-35380: Enable TCP_NODELAY for proactor event loop #10867 [3.7] bpo-35380: Enable TCP_NODELAY for proactor event loop (GH-10867) #10872 [3.6] bpo-35380: Enable TCP_NODELAY for proactor event loop (GH-10867). #10874

^{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/asvetlov'
closed_at = <Date 2018-12-05.08:30:55.381>
created_at = <Date 2018-12-02.23:04:50.570>
labels = ['3.7', '3.8', 'expert-asyncio']
title = 'Enable TCP_NODELAY for proactor event loop'
updated_at = <Date 2018-12-05.08:30:55.380>
user = 'https://github.com/asvetlov'

bugs.python.org fields:

activity = <Date 2018-12-05.08:30:55.380>
actor = 'asvetlov'
assignee = 'asvetlov'
closed = True
closed_date = <Date 2018-12-05.08:30:55.381>
closer = 'asvetlov'
components = ['asyncio']
creation = <Date 2018-12-02.23:04:50.570>
creator = 'asvetlov'
dependencies = []
files = []
hgrepos = []
issue_num = 35380
keywords = ['patch']
message_count = 4.0
messages = ['330903', '330974', '330982', '331095']
nosy_count = 2.0
nosy_names = ['asvetlov', 'yselivanov']
pr_nums = ['10867', '10872', '10874']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue35380'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']

[asvetlov]

We do it for selector based loops already, let's be consistent.

I think the feature should be backported to 3.7 too.

[asvetlov]

New changeset 3bc0eba by Andrew Svetlov in branch 'master':
bpo-35380: Enable TCP_NODELAY for proactor event loop (bpo-10867)
3bc0eba

[asvetlov]

New changeset fe91e9b by Andrew Svetlov (Miss Islington (bot)) in branch '3.7':
[3.7] bpo-35380: Enable TCP_NODELAY for proactor event loop (GH-10867) (GH-10872)
fe91e9b

[asvetlov]

New changeset bfb8818 by Andrew Svetlov in branch '3.6':
[3.6] bpo-35380: Enable TCP_NODELAY for proactor event loop (GH-10867). (GH-10874)
bfb8818