Fix asyncio.iscoroutinefunction to handle Mock objects

1st1

BPO	28703
Nosy	@gvanrossum, @1st1

^{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/1st1'
closed_at = <Date 2016-11-15.20:18:54.686>
created_at = <Date 2016-11-15.20:18:49.195>
labels = ['type-bug', '3.7', 'expert-asyncio']
title = 'Fix asyncio.iscoroutinefunction to handle Mock objects'
updated_at = <Date 2016-11-15.20:21:42.669>
user = 'https://github.com/1st1'

bugs.python.org fields:

activity = <Date 2016-11-15.20:21:42.669>
actor = 'python-dev'
assignee = 'yselivanov'
closed = True
closed_date = <Date 2016-11-15.20:18:54.686>
closer = 'yselivanov'
components = ['asyncio']
creation = <Date 2016-11-15.20:18:49.195>
creator = 'yselivanov'
dependencies = []
files = []
hgrepos = []
issue_num = 28703
keywords = []
message_count = 2.0
messages = ['280886', '280887']
nosy_count = 3.0
nosy_names = ['gvanrossum', 'python-dev', 'yselivanov']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue28703'
versions = ['Python 3.5', 'Python 3.6', 'Python 3.7']