Update bundled pip to 19.0

[pradyunsg]

BPO	35807
Nosy	@pfmoore, @ncoghlan, @dstufft, @pradyunsg, @miss-islington
PRs	bpo-35807: Upgrade ensurepip bundled pip and setuptools #12189 [3.7] bpo-35807: Upgrade ensurepip bundled pip and setuptools (GH-12189) #12192 [2.7] bpo-35807: Upgrade ensurepip bundled pip and setuptools (GH-12189) #12193

^{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 2019-03-10.11:26:37.882>
created_at = <Date 2019-01-22.19:37:03.113>
labels = ['type-feature', 'library']
title = 'Update bundled pip to 19.0'
updated_at = <Date 2019-03-10.11:26:37.881>
user = 'https://github.com/pradyunsg'

bugs.python.org fields:

activity = <Date 2019-03-10.11:26:37.881>
actor = 'ncoghlan'
assignee = 'none'
closed = True
closed_date = <Date 2019-03-10.11:26:37.882>
closer = 'ncoghlan'
components = ['Library (Lib)']
creation = <Date 2019-01-22.19:37:03.113>
creator = 'pradyunsg'
dependencies = []
files = []
hgrepos = []
issue_num = 35807
keywords = ['patch']
message_count = 5.0
messages = ['334230', '334830', '337293', '337535', '337536']
nosy_count = 5.0
nosy_names = ['paul.moore', 'ncoghlan', 'dstufft', 'pradyunsg', 'miss-islington']
pr_nums = ['12189', '12192', '12193']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue35807'
versions = []

[pradyunsg]

In line with https://bugs.python.org/issue35277.

Will also update setuptools while I do this. (if no one else gets to it, I'll file a PR tomorrow morning)

[pradyunsg]

Update: I'll do this after 19.0.2 is released.

[dstufft]

New changeset 01e0f43 by Donald Stufft (Pradyun Gedam) in branch 'master':
bpo-35807: Upgrade ensurepip bundled pip and setuptools (GH-12189)
01e0f43

[miss-islington]

New changeset 572205a by Miss Islington (bot) in branch '3.7':
bpo-35807: Upgrade ensurepip bundled pip and setuptools (GH-12189)
572205a

[miss-islington]

New changeset 55438d7 by Miss Islington (bot) in branch '2.7':
bpo-35807: Upgrade ensurepip bundled pip and setuptools (GH-12189)
55438d7