az login fails with python 3.7

[exFalso]

Describe the bug
There's a bug in the webbrowser module in newer python versions which affects the browser url opening when doing az login.

python bug report: https://bugs.python.org/msg322439

To Reproduce

$ az login
Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib64/python3.7/threading.py", line 917, in _bootstrap_inner
    self.run()
  File "/usr/lib64/python3.7/threading.py", line 865, in run
    self._target(*self._args, **self._kwargs)
  File "./virtualenv-az/lib/python3.7/site-packages/azure/cli/core/_profile.py", line 1033, in _get_authorization_code_worker
    succ = open_page_in_browser(url)
  File "./virtualenv-az/lib/python3.7/site-packages/azure/cli/core/util.py", line 266, in open_page_in_browser
    return webbrowser.open(url, new=2) # 2 means: open in a new tab, if possible
  File "/usr/lib64/python3.7/webbrowser.py", line 75, in open
    register_standard_browsers()
  File "/usr/lib64/python3.7/webbrowser.py", line 567, in register_standard_browsers
    cmd = _synthesize(cmdline, -1)
  File "/usr/lib64/python3.7/webbrowser.py", line 116, in _synthesize
    register(browser, None, controller, update_tryorder)
TypeError: register() takes from 2 to 3 positional arguments but 4 were given

Expected behavior
It should open a browser tab as usual

Environment summary
I'm using virtualenv for the install

$ python --version
Python 3.7.0
$ az --version
azure-cli (2.0.41)

acr (2.0.28)
acs (2.1.3)
advisor (0.5.1)
ams (0.1.1)
appservice (0.1.36)
backup (1.1.2)
batch (3.2.4)
batchai (0.3.1)
billing (0.1.8)
cdn (0.0.14)
cloud (2.0.15)
cognitiveservices (0.1.13)
command-modules-nspkg (2.0.1)
configure (2.0.17)
consumption (0.3.1)
container (0.2.1)
core (2.0.41)
cosmosdb (0.1.21)
dla (0.1.0)
dls (0.0.22)
dms (0.0.1)
eventgrid (0.1.12)
eventhubs (0.1.3)
extension (0.1.0)
feedback (2.1.3)
find (0.2.11)
interactive (0.3.25)
iot (0.1.21)
keyvault (2.0.23)
lab (0.0.22)
monitor (0.1.8)
network (2.1.5)
nspkg (3.0.2)
profile (2.0.27)
rdbms (0.2.5)
redis (0.2.14)
reservations (0.2.1)
resource (2.0.32)
role (2.0.26)
servicebus (0.1.2)
servicefabric (0.0.12)
sql (2.0.27)
storage (2.0.35)
vm (2.0.35)

Python location './virtualenv-az/bin/python'
Extensions directory '/home/exfalso/.azure/cliextensions'

Python (Linux) 3.7.0 (default, Jul 15 2018, 10:44:58) 
[GCC 8.1.1 20180531]

Legal docs and information: aka.ms/AzureCliLegal

Additional context

The bug can be worked around by catching the TypeError and simply retrying (the browsers are initialized at this point), like so:

def open_page_in_browser(url):
    if sys.platform.lower() == 'darwin':
        # handle 2 things:
        # a. On OSX sierra, 'python -m webbrowser -t <url>' emits out "execution error: <url> doesn't
        #    understand the "open location" message"
        # b. Python 2.x can't sniff out the default browser
        import subprocess
        return subprocess.Popen(['open', url])
    import webbrowser
    try:
        return webbrowser.open(url, new=2) # 2 means: open in a new tab, if possible
    except TypeError as err: # See https://bugs.python.org/msg322439. A simple retry works
        return webbrowser.open(url, new=2)