Unit test for loading valid URL

[Sahdev Zala]

The test_utils.py method def test_load_url_errors(self): fails on local test machines running tox where URL gets redirected by internet service provider.
The failure is due to the fact that since URL gets redirected, the urllib2.urlopen(path) used in the test method doesn't throw error as expected.
urllib2.urlopen(path)
<addinfourl at 140144329349888 whose fp = <socket._fileobject object at 0x7f75e652f8d0>>
vs
urllib2.urlopen("http://www.badurl.")
*** URLError: <urlopen error [Errno -2] Name or service not known>

For now the test has been modified under https://review.openstack.org/#/c/243750/2

If we find a way to create a test with valid url, we should create a new similar test.