Add a is_mount() to pathlib

[cooperlees]

BPO	30897
Nosy	@ambv, @cooperlees
PRs	bpo-30897: Add is_mount() to pathlib.Path #2669 bpo-30897: Document Path.is_mount(), update Misc/ACKS and Misc/NEWS #2980

^{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 2017-08-01.22:52:11.483>
created_at = <Date 2017-07-11.02:35:10.747>
labels = ['3.7', 'type-feature', 'library']
title = 'Add a is_mount() to pathlib'
updated_at = <Date 2017-08-01.23:40:25.154>
user = 'https://github.com/cooperlees'

bugs.python.org fields:

activity = <Date 2017-08-01.23:40:25.154>
actor = 'lukasz.langa'
assignee = 'none'
closed = True
closed_date = <Date 2017-08-01.22:52:11.483>
closer = 'cooperlees'
components = ['Library (Lib)']
creation = <Date 2017-07-11.02:35:10.747>
creator = 'cooperlees'
dependencies = []
files = []
hgrepos = []
issue_num = 30897
keywords = []
message_count = 3.0
messages = ['298104', '298110', '299639']
nosy_count = 2.0
nosy_names = ['lukasz.langa', 'cooperlees']
pr_nums = ['2669', '2980']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue30897'
versions = ['Python 3.7']

[cooperlees]

It would be nice to have pathlib.Path objects to have a ismount() function to return a bool if it is a POSIX mount point, similar to os.path.ismount(path)

[cooperlees]

Mocked up a concept PR. Will try teach myself how to test + see if I need to add Windows support etc.
https://github.com/cooperlees/cpython/commit/master

[ambv]

New changeset 173ff4a by Łukasz Langa (Cooper Lees) in branch 'master':
bpo-30897: Add is_mount() to pathlib.Path (bpo-2669)
173ff4a