`python_files/testing_tools/unittest_discovery.py` has a Tornado hack w/ no reference to an issue to replace the hack

[brettcannon]

vscode-python/python_files/testing_tools/unittest_discovery.py

Lines 13 to 23 in 209d6bd

	def get_sourceline(obj):
	try:
	s, n = inspect.getsourcelines(obj)
	except:
	try:
	# this handles `tornado` case we need a better
	# way to get to the wrapped function.
	# This is a temporary solution
	s, n = inspect.getsourcelines(obj.orig_method)
	except:
	return "*"

Those bare except statements are also extremely broad.

[eleanorjboyd]

this code will no longer be used once the test rewrite is finished and the old code is deleted.